Project Pokémon Bot

With the Local Distributors out in the wild due to the gigaleak, any Gen 6 and 7 event distribution can be achieved.
With the above said, do note that the intent of this post is to support individuals that managed to get their hands on a dev unit with the apps, and not for piracy.

Standard instructions
1. Use Checkpoint on your 3DS
2. Download the files from this page, and extract them into your Checkpoint's extdata
3. Restore the extdata into the local distributors.
4. Launch the game in distribution from extdata mode (hold down X + Y on game launch)
 
Instructions for troubleshooting and distributing custom events
-2. You're gonna need to have the distributor installed before any of this can work, obviously.
Launch the game in distribution from extdata mode (hold down X + Y on game launch)
-1. Only for Gen 7 distro: If you booted it before and it won't load, you gotta delete the secure value before attempting this. I recommend using savedatafiler to do that.
0. Download the file that was uploaded to this page
1. Go into the haishin folder
2. Replace the file that is named 1 with a wonder card full. Rename it to 1
3. If you like, you can change the distribution text (seen in info.txt) using a hex editor. I recommend HxD, but whatever really.
(Use a hex editor so that the placements of bytes in the file won't change)
4. Change your 3DS date to any date within the range of the template data (start and end date).
(tho in this data, the info.txt provided should cover all 3DS dates)
5. Use Checkpoint to import the extdata into the relevant distro.
6. Launch the game in distribution from extdata mode (hold down X + Y on game launch)


Note: from what I was told, the checksum on the wonder card full needs to be valid. Unless you know what you're doing, do not even attempt to create one.


So in the images in the screenshot, shows an Eternal Floette for Gen 6 (never distributed, totally custom card based on the speculated debug card),
and a Shiny Solgaleo for Gen 7 (was not a Local Wireless distribution, but only existed as serial code distribution. real card)

In an effort to keep our forums out of legal trouble (and stay afloat), I cannot stress this enough: do not ask for the distro, and do not link to the distro.
Doing that is against our site's rules.
Only the saves will be provided here.

And quick note: no, not aware of any method to distribute any G6 nor G7 event from PC to 3DS.
It feels as though the guide is as clear as it can be. I strongly suggest that no threads or posts be created asking for help or issues relating to this.
 
Notes:
If you get a "incorrect file size" error, that probably means you're using JKSM. Use checkpoint to restore the extdata.

This gift was distributed to the winners of a Daisuki Club lucky draw.

Starting from the international (excluding Mainland China) release of Let's Go Pikachu and Let's Go Eevee on the November 16th 2018, this gift could be redeemed by players that purchased a Pokéball Plus.

Besides the international release, there will eventually be a Mainland China release for the pair of games. Even though Switch games are region free, Nintendo Switch's from Mainland China are unable to play international titles. Reason being, they use a Nintendo Switch (some name it as Tencent Switch) with certain restrictions in place enforced by the firmware, such as restricted network connectivity and inability to play international game titles. China received their version of Let's Go Pikachu and Let's Go Eevee on the September 26th 2024. Along with the release of the games, they also received their own release of the Pokéball Plus. Unlike playability of Switch game titles, international Pokéball Plus can be redeemed on the Mainland China LGPE, vice versa. It is since known that the international versions of LGPE and chinese versions of LGPE have different BCATs (different wonder card servers, effectively). Despite that, the Mew redeemed would be the same between both versions as the different Mew card on the 2 different BCAT share the exact same data.
Note that Tencent Switch redemption of Mew can only be in CHS.

An internet connection is required to redeem the gift.
   Wonder Card ID #2001: Mythical Pokémon Mew Gift  Species   Mew   TID   (recipient)   Distribution   Poké Ball Plus   Location   Poké Ball Plus   Dates   Starting Nov 16, 2018   PID   Cannot Be Shiny   Games   Let's Go Pikachu & Eevee   Nature   Random   Card Per Save   Multiples Allowed                                                               
  Lv. 1       Moves   (ITALIC means Relearnable)   Pound   (None)   (None)   (None)  Lang
 Slot    OT Name    Nickname   Preset 
Lang   JPN    (recipient)    (default name)    ENG    (recipient)    (default name)    FRE    (recipient)    (default name)    GER    (recipient)    (default name)    ITA    (recipient)    (default name)    SPA    (recipient)    (default name)    KOR    (recipient)    (default name)    CHS    (recipient)    (default name)    CHT    (recipient)    (default name)   Format Ver.1.0.7-0, Post Updated Date:20190425_0654
What can be done with these files
PKM creation with PKHeX (drag & drop the wondercard file in the spot where you want the Pokémon) In-Game Mystery Gift redemption with Switch Gift Data Manager

This Shiny Zacian was given out to players, to commemorate the then upcoming release of Brilliant Diamond & Shining Pearl.
Breakdown of dates by country/region can be found here.
* Even though the wonder card data allows for redemption for on both Sword and Shield, not all sources of codes allow for that; only Korean distributed serial codes allows for redemption on either Sword or Shield. If the code came from international sources, the server only allows for redemption on Shield.
Korean serial code: Redeemable on Sword and Shield
Other international codes: Redeemable on Shield only.


 Wonder Card ID #1639: Shiny Zacian Gift  Species   Zacian   TID   211022   Distribution   Serial Code   Location   a lovely place   Dates   Oct 22, 2021 onwards   PID (forced)   29B82802 (Shiny)   Games   SWSH *   Nature   Adamant   Ability   Intrepid Sword (1)   Item   Rusted Sword    IVs   EVs HP 31   ALL
0 ATK 31   DEF 31   S.ATK 30   S.DEF 31   SPE 31  
  Lv. 100       Moves   (ITALIC means Relearnable)   Iron Head   Play Rough   Swords Dance   Sacred Sword

Classic Ribbon  Lang
 Slot  Mon's
 Lang  Nickname  OT Name OT's 
Lang   JPN  (default)  ガラル  JPN  ENG  (default)  Lancer  ENG  FRE  (default)  Lancer  FRE  ITA  (default)  Lancer  ITA  GER  (default)  Lancer  GER  SPA  (default)  Lancer  SPA  KOR  (default)  가라르  KOR  CHS  (default)  伽勒尔  CHS  CHT  (default)  伽勒爾  CHT Only One Redemption Allowed  Format Ver.2.1.2-9, Post Updated Date:20211022_0651

This Shiny Zamazenta was given out to players, to commemorate the then upcoming release of Brilliant Diamond & Shining Pearl.
Breakdown of dates by country/region can be found here.
* Even though the wonder card data allows for redemption for on both Sword and Shield, not all sources of codes allow for that; only Korean distributed serial codes allows for redemption on either Sword or Shield. If the code came from international sources, the server only allows for redemption on Sword.
Korean serial code: Redeemable on Sword and Shield
Other international codes: Redeemable on Sword only.


 Wonder Card ID #1640: Shiny Zamazenta Gift  Species   Zamazenta   TID   211022   Distribution   Serial Code   Location   a lovely place   Dates   Oct 22, 2021 onwards   PID (forced)   EB8F2802 (Shiny)   Games   SWSH *   Nature   Adamant   Ability   Dauntless Shield (1)   Item   Rusted Shield    IVs   EVs HP 31   ALL
0 ATK 31   DEF 31   S.ATK 30   S.DEF 31   SPE 31  
  Lv. 100       Moves   (ITALIC means Relearnable)   Iron Head   Close Combat   Iron Defense   Wide Guard

Classic Ribbon  Lang
 Slot  Mon's
 Lang  Nickname  OT Name OT's 
Lang   JPN  (default)  ガラル  JPN  ENG  (default)  Arthur  ENG  FRE  (default)  Arthur  FRE  ITA  (default)  Arthur  ITA  GER  (default)  Arthur  GER  SPA  (default)  Arthur  SPA  KOR  (default)  가라르  KOR  CHS  (default)  伽勒尔  CHS  CHT  (default)  伽勒爾  CHT Only One Redemption Allowed  Format Ver.2.1.2-9, Post Updated Date:20211022_0757

This Magearna has the TID hacked to be Shiny, nothing changed apart of that. There are no reports of a legitimate Shiny Magearna yet and Sword / Shield servers refuse to trade this Pokémon, so it has been concluded to be Shiny Locked.
The original one is downloadable here:
 

In Pokémon FireRed, LeafGreen & Emerald, lies a cave named the Altering Cave.
At first glance, all it has are wild Zubat, which makes me people ask "why the heck does this cave even exist to begin with".
As it turns out, there is more to this cave than it meets the eye.
This cave was programmed to make use of special Mystery Gifts, that would allow the wild Pokémon species present to be altered. (The species present changes every time one talks to the deliveryman)
Sadly, this game feature never had an event to make use of it.

Following it's initial release in Pokémon FireRed & LeafGreen, all the Pokémon that could have been caught from here,
could also be encountered in the extended Safari Zone of Pokémon Emerald.
(with the exception of Smeargle: it can be caught in Artisan cave in Battle Frontier)
Despite these Pokémon all being available in Pokémon Emerald, it's not known why this cave was also included for it.
This page hosts the Pokémon that can be encountered in an altered Altering Cave, as well as other means to get them to appear.
 
New update!
This page also holds a custom wonder card, that can be used to cycle through the encounters of Altering Cave, whenever you talk to the deliveryman!
Take note: if you toss/remove the wonder card, the encounters in Altering Cave will be stuck at the last species encountered.
Also note: FireRed/LeafGreen & Emerald have their own wonder cards. FRLG cannot use Emerald wonder card and vice versa.

The encounters that get cycled are (and it wraps back to the start):
Zubat, Mareep, Pineco, Houndour, Teddiursa, Aipom, Shuckle, Stantler, Smeargle.
International
Wonder Card
(ENG FRE GER ITA SPA)
Card is English language,
but works on the
languages listed.
Japanese
Wonder Card (Hint: You'll need the WC3TOOL or WC3Plugin to inject wonder cards into your save.)

Also, PKHeX usage:
Pokémon FireRed and LeafGreen: Event constant 36
Pokémon Emerald: Event constant 62

Cycling through 0 to 8 in the above given event constant, results in the rotation of the species that appears.

Also, for cheat code usage:
Pokémon FireRed and LeafGreen:
Pokémon Emerald Codes:

Credits to the Pokémon: @HaxAras
Credits to codes: @BlackShark

Original Post:

This gift was given out via 2 ways: a lucky draw, and via a free gift for NTT Flets (a Japanese fiber internet) users who signed up for the gift.
For the lucky draw:
There were 100 winners per Festa 2005 location, and there were 9 locations, so that's 900 winners from the drawing
For the NTT Flets members:
People who used NTT Flets were able to sign up and receive the Wobbuffet for free without having to be selected, and there's no known number for how many people downloaded it while being a user of NTT Flets. So the amount in circulation are unknown.

This gift was based on the live-action Wobbuffet that appeared on the Pokémon Sunday TV show.

Pokémon Game Generations Rayquaza
This Rayquaza was chosen through a poll of mascots of main games in the Pokémon series. It was distributed at Pokémon Centers during the above dates.
     Species   Rayquaza   Nickname   (default, save lang)   OT   せんきょ   TID   02102   Distribution   Local Wireless   Location   Pokémon Event   Dates   February 10 to 27, 2012   PID   Cannot Be Shiny   Games   BW                                                                Lv. 100    Nature   Random   Ability   Air Lock (1)   Item    Life Orb    Card Per Save   Only One Allowed    Moves   (ITALIC means Relearnable)   Extreme Speed   Hyper Beam   Dragon Pulse   V-create   WC ID 58: 「れきだいゲーム　ポケモンそうせんきょ」's receiving text 0x43 Thank you for coming to the Pokémon event! Please pick up your gift from the deliveryman in any Pokémon Center.

Classic れきだいゲーム　ポケモンそうせんきょ れきだいゲームのパッケージに
とうじょうするポケモンから、
みんなにえらばれて　みごと１いになった
レックウザをプレゼント！ Format Ver.3.0.1-5, Post Updated Date:20231022_1546

The international version of the Ageto Celebi Event was translated and programmed into Pokemon Colosseum, but was never released to players.
@HaxAras managed to use some codes and trickery to gain access to them.
 
Statement regarding the event:
Original Thread:
Thanks to @SkyLink98 for the Italian SOFO Celebi.

Event description
This is an event raid held by Scarlet and Violet. Notably, with this event you get a chance to encounter Tera raids featuring a level 100 (Shiny locked) Greninja with the Poison Tera type.
This event ran from January 27 to January 29, and from February 10 to February 12, 2023.

How to encounter this raid in-game
For this raid to be findable by players, they must first have unlocked 6-Stars Raids through story progression. This requires completing the entire game story and the post game until the academy tournament. Players must then complete 10 4 stars or 5 stars raids.

Only after all these steps have been performed, the player will receive a call from Jacq, which he will proceed to tell you about dangerous black crystal raids.

What can be done with these files
The files to be imported into your save file are placed in the Files directory. We also provide human-readable data in Json format, and an Identifier.txt file containing the event index.
Use our tutorial to import these files into your save.
After importing you might need to advance one day in the Date/Time from your console System Settings, to reroll the dens.
To see other Poké Portal Events, here.

The international version of the Colosseum Bonus Disc Pikachu was translated and programmed into Pokemon Colosseum, but was never released to players.
@HaxAras managed to use some codes and trickery to gain access to the english events.
Statement regarding the event:
Original Thread:
Thanks to @SkyLink98 for the Italian ARENA Pikachu.

This gift was given to players through the serial code PTCCHAMP10N2122, revealed during the Pokémon Trainers Cup 2023 stream. This Pokémon is based on the Gastrodon used by Jung Wonseok during Pokémon Trainers Cup 2022.

   Wonder Card ID #1005: 정원석’s Gastrodon Gift  Species   Gastrodon (East Sea)   TID   230603   Distribution   Serial Code   Location   a Battle Competition   Dates   17th June 2023   PID   Cannot Be Shiny   Games   Scarlet Violet   Nature   Bold   Ability   Storm Drain (2)   Item   Leftovers  Tera:     IVs   EVs HP 31   180 ATK 0   0 DEF 31   204 SPA 31   0 SPD 31   124 SPE 8   0
  Lv. 50       Moves   (ITALIC means Relearnable)   Earth Power   Ice Beam   Yawn   Protect

Battle Champion Ribbon  Lang
 Slot  Mon's
 Lang  Nickname  OT Name OT's 
Lang   JPN  트리토돈  정원석  KOR  ENG  트리토돈  정원석  KOR  FRE  트리토돈  정원석  KOR  ITA  트리토돈  정원석  KOR  GER  트리토돈  정원석  KOR  SPA  트리토돈  정원석  KOR  KOR  트리토돈  정원석  KOR  CHS  트리토돈  정원석  KOR  CHT  트리토돈  정원석  KOR Only One Redemption Allowed  Format Ver.3.0.1-5, Post Updated Date:20230617_1756
What can be done with these files
PKM creation with PKHeX (drag & drop the wondercard file in the spot where you want the Pokémon) In-Game Mystery Gift redemption with Switch Gift Data Manager

The Key Item Azure Flute, which would allow a holy encounter with Arceus, was never legitimately released to players.
However, found within a file (decchi.bin), that was found in Generation 4 distribution carts for Deoxys, (Uploader's note: file-ception at it's finest)
It appears that an Azure Flute distribution was being tested via slot-2 distribution.

The nature of the slot-2 distribution game that this wonder card was obtained from, only allowed distribution to JPN games.
The distribution text seems to be reusing the distribution text for a Generation 3 Old Sea Chart distribution.
It was also discovered by @Deoxyz that changing the distribution type from Key Item to Pokemon, will show complete information for an Infernape to be received.

It was also discovered by @DeadSkullzJr that the copy of the wonder card in the game (seen via hex) slightly differs from the wonder card that was received. The one in the game has a redistribution count. Presumably this copy has the redistribution count, but the received one does not, because it does not allow players who received a copy to redistribute.

The Key Item Azure Flute wonder card (.pcd), Modified to show Infernape (.pcd) and the Infernape (.pkm) are up for download.
[We will not host the decchi.bin or Distribution Roms for the Deoxys]
 
Update: Even though the remakes Brilliant Diamond and Shining Pearl included a way to get Azure Flute and the Hall of Origin Arceus encounter, owning the Gen 4 HoO Arceus would still be illegal.
 
File Info
Gen 4 Decchi - Azure Flute.pcd - Extracted from save that received it. The one without redistribution count.
Gen 4 Decchi - Azure Flute (Hex Extracted, Redistribution count).pcd - Hex extracted from the game. The one with redistribution count.
Gen 4 Decchi - Infernape.pcd - The receiving type was modified to show the Infernape gift hiding within
Gen 4 Decchi - Infernape.pkm - A pk4 file of the extracted Infernape.
 
Wonder card Images

While this wonder card will activate the event, the Arceus will be flagged as illegal.

Use at your own risk.
 
Images regarding Infernape:

 
Original Threads:

This gift was given to players of Pokémon HOME, as a reward for completing the National Dex. Initially, due to issues with the detection code, players had to shift their entire living dex in their boxes in one session, in order to unlock this Mystery Gift in their Pokémon HOME.
This event also marks the first time Original Color Magearna became available to players.
 
It appears that this gift was initially intended to be released at launch, however they weren't ready to release it; they instead accidentally gave out a Lv.10 Magearna that had 15 ribbons attached to it.

The unlocking of this Mystery Gift temporarily stopped rolling out for public. However if it was already in your Mystery Gift box, one could still claim it.
There were a few reports of a Lv.10 original color Magearna with 15 ribbons presumably because of this.

Do note, in the first version of this gift the PID was fixed. It also appears the recipient cannot have a TID/SID combo what would allow one to be shiny.
The Pokémon Home 3.0 update made some changes to the Mystery Gift behaviour. The Rev. 2 of this Gift granted players a Pokémon with random PID, Encryption Constant and HT/WT.

In the mobile app version of Pokémon HOME, players were able to receive a special Pichu by completing any challenge (to obtain a sticker),
and placing the sticker in a binder.
Players can receive it from the Mystery Gift > Gift Box option.
As per any Mystery gift redeemed on Pokémon HOME, this Pokémon's language follows the language that was set on the mobile app.
This Pokémon's OT Gender follows the gender of the avatar the player picked.
The first version of this Gift, up until the Pokémon HOME 3.0 update, granted a Pokémon with PID, Encryption Constant, and HT/WT with null values.
The Pokémon Home 3.0 update made some changes to the Mystery Gift behaviour. The Rev. 2 of this Gift granted players a Pokémon with random PID, Encryption Constant and HT/WT.

Using the mobile app, when the player deposits a Pokémon into GTS, and that Pokémon was selected for a trade,
the player can then receive this Rotom from the Mystery Gift > Gift Box option.
As per any Mystery gift redeemed on Pokémon HOME, this Pokémon's language follows the language that was set on the mobile app.
This Pokémon's OT Gender follows the gender of the avatar the player picked.
The first version of this Gift, up until the Pokémon HOME 3.0 update, granted a Pokémon with PID, Encryption Constant, and HT/WT with null values.
The Pokémon Home 3.0 update made some changes to the Mystery Gift behaviour. The Rev. 2 of this Gift granted players a Pokémon with random PID, Encryption Constant and HT/WT.

Using the mobile app, when the player deposits a Pokémon into the Wonder Box, and that Pokémon was then traded away,
the player would then be qualified to receive this Eevee from the Mystery Gift > Gift Box option.
Basically, the player gets the Eevee for their first successful trade via the Wonder Box.
As per any Mystery gift redeemed on Pokémon HOME, this Pokémon's language follows the language that was set on the mobile app.
This Pokémon's OT Gender follows the gender of the avatar the player picked.
The first version of this Gift, up until the Pokémon HOME 3.0 update, granted a Pokémon with PID, Encryption Constant, and HT/WT with null values.
The Pokémon Home 3.0 update made some changes to the Mystery Gift behaviour. The Rev. 2 of this Gift granted players a Pokémon with random PID, Encryption Constant and HT/WT.

This Pikachu is waiting for the player in the PC, when the players accesses their HOME's PC for the very first time.
If the player's first login is on the Nintendo Switch, this Pikachu's language is set to Japanese.
If the player's first login was on the mobile app, this Pikachu's language follows the language that was set when launching the application.

This Pikachu's OT Gender is set to Male.
The first version of this Gift, up until the Pokémon HOME 3.0 update, granted a Pokémon with PID, Encryption Constant, and HT/WT with null values.
The Pokémon Home 3.0 update made some changes to the Mystery Gift behaviour. The Rev. 2 of this Gift granted players a Pokémon with random PID, Encryption Constant and HT/WT.

When players first launch the mobile app version of Pokémon HOME, they'll be given a choice to choose a Kanto starter.
This Kanto starter comes with it's hidden ability.
This Pokémon's language follows the language that was set on the mobile app.
This Pokémon's OT Gender follows the gender of the avatar the player picked.
The first version of this Gift, up until the Pokémon HOME 3.0 update, granted a Pokémon with PID, Encryption Constant, and HT/WT with null values.
The Pokémon Home 3.0 update made some changes to the Mystery Gift behaviour. The Rev. 2 of this Gift granted players a Pokémon with random PID, Encryption Constant and HT/WT.

When players first launch the mobile app version of Pokémon HOME, they'll be given a choice to choose a Kanto starter.
This Kanto starter comes with it's hidden ability.
 
This Pokémon's language follows the language that was set on the mobile app.
This Pokémon's OT Gender follows the gender of the avatar the player picked.
 
The first version of this Gift, up until the Pokémon HOME 3.0 update, granted a Pokémon with PID, Encryption Constant, and HT/WT with null values.
The Pokémon Home 3.0 update made some changes to the Mystery Gift behaviour. The Rev. 2 of this Gift granted players a Pokémon with random PID, Encryption Constant and HT/WT.

When players first launch the mobile app version of Pokémon HOME, they'll be given a choice to choose a Kanto starter.
This Kanto starter comes with it's hidden ability.
This Pokémon's language follows the language that was set on the mobile app.
This Pokémon's OT Gender follows the gender of the avatar the player picked.
The first version of this Gift, up until the Pokémon HOME 3.0 update, granted a Pokémon with PID, Encryption Constant, and HT/WT with null values.
The Pokémon Home 3.0 update made some changes to the Mystery Gift behaviour. The Rev. 2 of this Gift granted players a Pokémon with random PID, Encryption Constant and HT/WT.

In Japan, starting from Apr 24, 2019, with any purchase of either Let's Go Pikachu or Let's Go Eevee games at supported retailers in Japan,
the purchase will come along with a free adventure guidebook as well as a serial code for 100x Poké Balls.
 Wonder Card ID #0003: Purchase Bonus    Here's what you got:    Poké Ball x100                                 Serial Code |  LGPE  | Starting Apr 24, 2019 Format Ver.1.0.8-0, Post Updated Date:20190513_0819
What can be done with these files
In-Game Mystery Gift redemption with Switch Gift Data Manager

This gift was distributed via Serial Code to players who preordered the movie tickets to M22: Mewtwo's Counterattack Evolution in Japan.
This gift comes with 200 in every AV stat. Additionally 3 out of 6 IV stat are 31, and the rest have the value of 30.
The Trainer ID signifies the date of M01: Mewtwo Strikes Back's first release in Japan: July 18th, 1998.
* Interestingly, there are bitflags that indicates that 2 additional (unknown) games are eligible to receive this wonder card. Maybe they're testing it on Sword & Shield?
(Note: The event redemption period ends before Sword & Shield is released, though)
Thanks @wo0ts for his contribution!
   Wonder Card ID #0002: Mewtwo Gift  Species   Mewtwo   TID   980718   Distribution   Serial Code   Location   2019 Pokémon Movie   Dates   Apr 12 to Sep 30, 2019   PID   Cannot Be Shiny   Games   Let's Go Pikachu & Eevee 
 * ?1 ?2   Nature   Quiet   Card Per Save   Multiples Allowed                                                               
  Lv. 70       Moves   (ITALIC means Relearnable)   Psychic   Shadow Ball   Barrier   Calm Mind  Lang
 Slot    OT Name    Nickname   Preset 
Lang   JPN    はかせ    (default name)    ENG    はかせ    (default name)    FRE    はかせ    (default name)    GER    はかせ    (default name)    ITA    はかせ    (default name)    SPA    はかせ    (default name)    KOR    はかせ    (default name)    CHS    はかせ    (default name)    CHT    はかせ    (default name)   Format Ver.1.0.7-0, Post Updated Date:20190425_0658
What can be done with these files
PKM creation with PKHeX (drag & drop the wondercard file in the spot where you want the Pokémon) In-Game Mystery Gift redemption with Switch Gift Data Manager

This gift was distributed to players in the US via the Pokémon Pass app. By accessing the app in any Best Buy store, players get serial codes that can be used to redeem this Mewtwo.
The giveaway dates on the app is between November 4th to November 14, 2019. That being said, some players have been able to access it as early as November 1st.
The redemption of the code is till March 5th, 2020.
As events for Let's Go Pikachu & Eevee are not region locked, the serial code can be redeemed on Switches of any region.

   Wonder Card ID #0503: Mewtwo Gift  Species   Mewtwo   TID   191104   Distribution   Serial Code   Location   a lovely place   Dates   Nov 04 '19 to Mar 05, '20   PID   Cannot Be Shiny   Games   Let's Go Pikachu & Eevee   Nature   Random   Card Per Save   Only One Allowed                                                               
  Lv. 70       Moves   (ITALIC means Relearnable)   Amnesia   Psychic   Teleport   Recover  Lang
 Slot    OT Name    Nickname   Preset 
Lang   JPN    Giovanni    (default name)    ENG    Giovanni    (default name)    FRE    Giovanni    (default name)    ITA    Giovanni    (default name)    GER    Giovanni    (default name)    SPA    Giovanni    (default name)    KOR    Giovanni    (default name)    CHS    Giovanni    (default name)    CHT    Giovanni    (default name)   Format Ver.1.0.8-3b4, Post Updated Date:20191102_0311
What can be done with these files
PKM creation with PKHeX (drag & drop the wondercard file in the spot where you want the Pokémon) In-Game Mystery Gift redemption with Switch Gift Data Manager