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This gift is distributed to players via a serial code, given in participating stores in Europe, from Aug 27 to Sept 27, 2021.
Using the Dynamax Crystal would allow Gigantamax Duraludon to appear at the Watchtower Lair's Den as a max raid.
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.
 Wonder Card ID #0515: Dynamax Crystal Gift   Here's what you got:    ★Sgr7121 x1                                   Serial Code | SWSH | Only One Allowed | Aug 27 to Sept 27, 2021 Format Ver.2.1.2-0, Post Updated Date:20210827_1124

This is a Wild Area event held by Sword and Shield. This event gives players a chance to find a Shiny Cinccino in 5-star raids.
Only the files "normal_encount", "normal_encount_rigel2" and "normal_encount_rigel3" were actually updated to Index 83.
 
To import these files into your save, use PKHeX's block importing function. Our tutorial should guide you through it.
Our first post of this page contains some data relevant to the importing stage.
There's info and some common questions regarding Wild Area Events here.
To see other Wild Area Events, here.

This event has been made available with the code 1STPTCCHAMP, announced during the Korean Pokémon Trainers Cup stream. The Pokémon is based on the Jeong Sang-yoon's Porygon-Z.
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.

   Wonder Card ID #1023: 정상윤's Porygon-Z  Species   Porygon-Z   TID   210807   Distribution   Serial Code   Location   a Battle Competition   Dates   Aug 21 to 22, 2021   PID   Cannot Be Shiny   Games   SWSH   Nature   Timid   Ability   Adaptability (1)   Item   Silk Scarf    IVs   EVs HP 31   6 ATK 0   0 DEF 31   0 S.ATK 31   252 S.DEF 31   0 SPE 31   252
  Lv. 50       Moves   (ITALIC means Relearnable)   Hyper Beam   Thunderbolt   Dark Pulse   Nasty Plot

Battle Champion Ribbon  Lang
 Slot  Mon's
 Lang  Nickname  OT Name OT's 
Lang   JPN  폴리곤Z  정상윤  KOR  ENG  폴리곤Z  정상윤  KOR  FRE  폴리곤Z  정상윤  KOR  ITA  폴리곤Z  정상윤  KOR  GER  폴리곤Z  정상윤  KOR  SPA  폴리곤Z  정상윤  KOR  KOR  폴리곤Z  정상윤  KOR  CHS  폴리곤Z  정상윤  KOR  CHT  폴리곤Z  정상윤  KOR Only One Redemption Allowed  Format Ver.2.1.2-0, Post Updated Date:20210821_1155

This is a Wild Area event held by Sword and Shield. This event hosts Ghost Pokemon, with a chance of encountering a Gigantamax Gengar and a Shiny Chandelure in 5-star raids.
This event created a precedent, as only "normal_encount", "normal_encount_rigel2" and "normal_encount_rigel3" files were actually updated to Index 81, whereas "dai_encount", "bonus_rewards" and "drop_rewards" remained unchanged from the old Index 80.
 
To import these files into your save, use PKHeX's block importing function. Our tutorial should guide you through it.
Our first post of this page contains some data relevant to the importing stage.
There's info and some common questions regarding Wild Area Events here.
To see other Wild Area Events, here.

This event has been made available with the code V1CT0RYENG1NE25, announced during the Pokémon Players Cup Invitational stream. The Pokémon is based on the Wolfe Glick's Coalossal.
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.

   Wonder Card ID #0514: Coalossal Gift  Species   Coalossal    TID   210813   Distribution   Serial Code    Location   a lovely place   Dates   Aug 14 to Aug 16, 2021   PID   Cannot Be Shiny   Games   SWSH   Nature   Modest   Ability   Steam Engine (1)   Item   Weakness Policy    IVs   EVs HP 31   68 ATK 0   0 DEF 31   4 S.ATK 31   252 S.DEF 31   4 SPE 31   180
  Lv. 50       Moves   (ITALIC means Relearnable)   Protect   Meteor Beam   Heat Wave   Solar Beam

Battle Champion Ribbon  Lang
 Slot  Mon's
 Lang  Nickname  OT Name OT's 
Lang   JPN  Coalossal  Wolfe  ENG  ENG  Coalossal  Wolfe  ENG  FRE  Coalossal  Wolfe  ENG  ITA  Coalossal  Wolfe  ENG  GER  Coalossal  Wolfe  ENG  SPA  Coalossal  Wolfe  ENG  KOR  Coalossal  Wolfe  ENG  CHS  Coalossal  Wolfe  ENG  CHT  Coalossal  Wolfe  ENG Only One Redemption Allowed  Format Ver.2.1.0-1b, Post Updated Date:20210814_1855

The Players Cup 4 was an online tournament where players around the world could take part to win prizes. During the stream, a Beast Ball was distributed to viewers and players around the world, via serial code PC4F1NALSBEAST.
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.
 Wonder Card ID #0517: Beast Ball Gift   Here's what you got:    Beast Ball x1                                   | SWSH | Only One Allowed | From July 30 to Aug 2, 2021 Format Ver.2.1.0-1b, Post Updated Date:20210731_2244

During the live stream of the Pokémon Japan Tournament 2021, a Torkoal based on PJCS2020 Champion's Torkoal will be given away.
The common serial code is PJCS2020CHAMP.

The nickname flag will be set received by a game that its language isn't Japanese.
The nickname flag will be unset when received by a game that its language is Japanese.
Either way, the language tag will be JPN.
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.

   Wonder Card ID #0137: クララ's Torkoal  Species   Torkoal   TID   210718   Distribution   Serial Code   Location   a Battle Competition   Dates   July 18 to July 19, 2021    PID   Cannot Be Shiny   Games   SWSH   Nature   Bold   Ability   Drought (2)   Item   Sitrus Berry    IVs   EVs HP 31   236 ATK 12   0 DEF 31   20 S.ATK 31   0 S.DEF 31   252 SPE 0   0
  Lv. 50       Moves   (ITALIC means Relearnable)   Burning Jealousy   Body Press   Yawn   Protect

Battle Champion Ribbon  Lang
 Slot  Mon's
 Lang  Nickname  OT Name OT's 
Lang   JPN  コータス  クララ  JPN  ENG  コータス  クララ  JPN  FRE  コータス  クララ  JPN  ITA  コータス  クララ  JPN  GER  コータス  クララ  JPN  SPA  コータス  クララ  JPN  KOR  コータス  クララ  JPN  CHS  コータス  クララ  JPN  CHT  コータス  クララ  JPN Only One Redemption Allowed  Format Ver.2.1.0-1b, Post Updated Date:20210718_0916

The Players Cup 4 was an online tournament where players around the world could take part to win prizes. During the stream, a Gold Bottle Cap was distributed to viewers and players around the world, via serial code PLAYERSCH01CEPC.
 
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.
 Wonder Card ID #0516: Gold Bottle Cap Gift   Here's what you got:    Gold Bottle Cap x1                                 Serial Code  | SWSH | Only One Allowed | From 17 to 18 July 2021 Format Ver.2.1.0-1b, Post Updated Date:20210717_2244

This is a Wild Area event held by Sword and Shield.  This event does not appear to host any Gigantamaxes.
This event give players a chance to encounter a shiny Grapploct from 5-star Raids.
 
To import these files into your save, use PKHeX's block importing function. Our tutorial should guide you through it.
Our first post of this page contains some data relevant to the importing stage.
There's info and some common questions regarding Wild Area Events here.
To see other Wild Area Events, here.

This gift is distributed starting from November 6, 2020 as a purchase bonus for the Pokémon Sword + Expansion Pack or the Pokémon Shield + Expansion Pack in the retail format.
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.
 Wonder Card ID #1626: Purchase Bonus   Here's what you got:    Poke Ball x100                                   Serial Code | SWSH | Only One Allowed | Starting from Nov 6, 2020 Format Ver.2.0.0-12b, Post Updated Date:20201112_1759

This gift was distributed as part of the Pokémon Get Challenge campaign. The gift codes can be obtained from participating products in Japan.
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.
 Wonder Card ID #0132: Item Set Gift   Here's what you got:    Lure Ball x1    Heavy Ball x1    Friend Ball x1    Moon Ball x1                 Serial Code | SWSH | Only One Allowed | 20 Nov '20 to 30 Apr '21 Format Ver.2.0.0-12b, Post Updated Date:20201120_1054

This gift was distributed as part of the Pokémon Get Challenge campaign. The gift codes can be obtained from participating products in Japan.
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.
 Wonder Card ID #0131: Item Set Gift   Here's what you got:    Fast Ball x1    Level Ball x1    Love Ball x1                       Serial Code | SWSH | Only One Allowed | 20 Nov '20 to 30 Apr '21 Format Ver.2.0.0-12b, Post Updated Date:20201120_1037

This gift was distributed as part of the Pokémon Get Challenge campaign. The gift codes can be obtained from participating products in Japan.
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.
 Wonder Card ID #0133: Item Set Gift   Here's what you got:    Safari Ball x1    Sport Ball x1                           Serial Code  | SWSH | Only One Allowed | 20 Nov '20 to 30 Apr '21 Format Ver.2.0.0-12b, Post Updated Date:20201120_1106

This gift was distributed as part of the Pokémon Get Challenge campaign. The gift codes can be obtained from participating products in Japan.
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.
 Wonder Card ID #0134: Master Ball Gift   Here's what you got:    Master Ball x1                                   Serial Code | SWSH | Only One Allowed | 20 Nov '20 to 30 Apr '21 Format Ver.2.0.0-12b, Post Updated Date:20201120_1110

Starting from Nov 6 to Nov 10 2020, the official poke_times Twitter Account started an event challenge to commemorate the release of The Crown Tundra DLC. Only 10.000 winners will be able to redeem this event code. The details about this campaign can be found here: https://www.pokemon.co.jp/info/2020/11/201106_cm01.html
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.
 Wonder Card ID #0136: Big Nuggets Gift   Here's what you got:    Big Nugget x50                                   Serial Code | SWSH | Only One Allowed | Nov 11 to Dec 31, 2020 Format Ver.2.0.0-12b, Post Updated Date:20201112_1559

This gift was distributed as part of the Pokémon Get Challenge campaign. The gift codes can be obtained from participating products in Japan.
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.
 Wonder Card ID #0130 & #0135: Dynite Ore Gift   Here's what you got:    Dynite Ore x10                                   Serial Code | SWSH | Only One Allowed | 20 Nov '20 to 30 Apr '21 Format Ver.2.0.0-12b, Post Updated Date:20201120_1110

Originally meant to be distributed in December 2020, this gift including a Galarica Wreath was then distributed during the Crown Tournament livestream in February, 2021.
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.
 Wonder Card ID #1011: Galarica Wreath Gift   Here's what you got:    Galarica Wreath x1                                   Serial Code | SWSH | Only One Allowed | Feb 6 to Feb 7, 2021 Format Ver.2.1.0-1b, Post Updated Date:20210206_1515

This gift was given over Internet for Gigantamax Pikachu Raids defeated over 874k times.
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.
 Wonder Card ID #1638: Item Set Gift   Here's what you got:    Armorite Ore x87    Dynite Ore x87                             Online Wi-Fi | SWSH | Only One Allowed | 2 March to 14 March, 2021 Format Ver.2.1.0-1b, Post Updated Date:20210302_0940

This event was announced during a Pokémon Korea video about Dynamax Adventures. Users can use the code ADVENTUREB9F through Mystery Gift to receive the items listed.
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.
 Wonder Card ID #1021: Item Set Gift   Here's what you got:    Big Nugget x12    Exp. Candy XL x12                             | SWSH | Only One Allowed | 27 Mar to 3 Apr 2021 Format Ver.2.1.0-1b, Post Updated Date:20210327_2204

This gift is distributed to players via a serial code, given in participating stores in Europe, from March 19 to April 19 2021.
Using the Dynamax Crystal would allow Gigantamax Flapple (Pokémon Shield) or Gigantamax Appletun (Pokémon Sword) to appear at the Watchtower Lair's Den as a max raid.
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.
 Wonder Card ID #0510: Dynamax Crystal Gift   Here's what you got:    ★Sgr6913 x1                                   Serial Code | SWSH | Only One Allowed | Mar. 19 - Jul. 31, 2021 Format Ver.2.1.0-1b, Post Updated Date:20210319_1241

During the Players Cup stream, a new event contaning a Dream Ball has been announced to be available for redemption. The item is obtainable by entering the serial code "DREAMB1GPC3" in the Mystery Gift option menu in the available dates.
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.
 Wonder Card ID #0511: Dream Ball Gift   Here's what you got:    Dream Ball x1                                   | SWSH | Only One Allowed | 10 Apr to 12 Apr 2021 Format Ver.2.1.0-1b, Post Updated Date:20210410_2345

During the Players Cup 3 stream, the event code "WPF1NALSPC3" was given to the player to redeem a Weekness Policy item in Sword and Shield.
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.
 Wonder Card ID #0512: Weakness Policy Gift   Here's what you got:    Weakness Policy x1                                   | SWSH | Only One Allowed | 23 to 26 Apr. 2021 Format Ver.2.1.0-1b, Post Updated Date:20210424_1510

This gift was distributed as part of the Pokémon Adventure 25 (Grab these Mythicals) campaign.
The gift codes can be obtained via exchanging scraps for codes.
User could exchange their scraps on this site: http://adventure25pokemonkorea.co.kr/
Do note this site limits access to Korean IP only.
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.
 Wonder Card ID #1016: Item Set Gift   Here's what you got:    Fast Ball x1    Level Ball x1    Love Ball x1                       | SWSH | Only One Allowed | Apr 26 to Oct 31, 2021 Format Ver.2.1.0-1b, Post Updated Date:20210426_1022

This gift was distributed as part of the Pokémon Adventure 25 (Grab these Mythicals) campaign.
The gift codes can be obtained via exchanging scraps for codes.
User could exchange their scraps on this site: http://adventure25pokemonkorea.co.kr/
Do note this site limits access to Korean IP only.
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.
 Wonder Card ID #1017: Item Set Gift   Here's what you got:    Lure Ball x1    Heavy Ball x1    Friend Ball x1    Moon Ball x1                 | SWSH | Only One Allowed | Apr 26 to Oct 31, 2021 Format Ver.2.1.0-1b, Post Updated Date:20210426_1025

This gift was distributed as part of the Pokémon Adventure 25 (Grab these Mythicals) campaign.
The gift codes can be obtained via exchanging scraps for codes.
User could exchange their scraps on this site: http://adventure25pokemonkorea.co.kr/
Do note this site limits access to Korean IP only.
As of LGPE, wonder cards are no longer stored in saves. As such, players will not be able to inject this event into their save using PKHeX.
 Wonder Card ID #1018: Item Set Gift   Here's what you got:    Safari Ball x1    Sport Ball x1                             | SWSH | Only One Allowed | Apr 26 to Oct 31, 2021 Format Ver.2.1.0-1b, Post Updated Date:20210426_1029