theSLAYER

The conditions for unlocking this gift is presently unclear.
It appears that there's two conditions the player needs to satisfy:
(1) Have 15 successful Dynamax Adventures
(2) Capture at least 4 Ultra Beasts from Dynamax Adventures.
This gift is shiny locked.
At that point, it would appear in the overworld of the Max Lair, and players can receive it.
In order for Ultra Beasts to appear in the Dynamax Adventures, players must complete the story of Crown Tundra.

After completing the main story of Crown Tundra, the player is able to receive Cosmog from one of the villagers in a house in Freezington. This Cosmog gift is shiny locked.

After the player captures Regirock, Regice and Registeel at their individual ruins in the Crown Tundra, the player can go to the Split-Decision Ruins and choose to encounter either Regieleki or Regidrago. The choice is made by illuminating the floor tiles to match the design of the dots on the wanted golem's face. Once the choice has been made, the decision cannot be undone, even if the chosen Regi has yet to be caught.
In order to open the door to enter the ruins, the first requirement is to have players capture Regirock, Regice and Registeel on that save. The second requirement is for Regirock, Regice and Registeel to be in the player's party while interacting with the door. These 3 can be of any origin (doesn't matter if transferred from HOME or caught in Crown Tundra).

After the player captures Regirock, Regice and Registeel at their individual ruins in the Crown Tundra, the player can go to the Split-Decision Ruins and choose to encounter either Regieleki or Regidrago. The choice is made by illuminating the floor tiles to match the design of the dots on the wanted golem's face. Once the choice has been made, the decision cannot be undone, even if the chosen Regi has yet to be caught.
In order to open the door to enter the ruins, the first requirement is to have players capture Regirock, Regice and Registeel on that save. The second requirement is for Regirock, Regice and Registeel to be in the player's party while interacting with the door. These 3 can be of any origin (doesn't matter if transferred from HOME or caught in Crown Tundra).

 
 

Transferring Meltan from Pokémon Go to Let's Go Pikachu and Lets Go Eevee is the only way for the games to receive Meltan, as this Pokémon cannot be in encountered in those games. The Original Trainer for Pokémon Go was changed for privacy purposes.
Shiny Meltan (captured by @wo0ts) was temporarily added to the shiny pool during the Lunar New Year Event (2019).
During the Lunar New Year Event (2019) in Pokémon Go, shiny Meltan has a chance of appearing from using the Mystery Box, duration listed below.
This event also marked the first time a Shiny Meltan was made available to players.

The cool down between box usage were temporarily reduced to 3 days instead of the standard 7 days.


The slated period for the event was between Feb. 5, 2019, at 1 p.m. PST (GMT -8) to Mar. 4, 2019, at 11:59 p.m. PST (GMT -8).
   Go Park Transfer  Species   Meltan   TID   (recipient)   Distribution   Pokemon Go   Location   GO Park complex   Dates   Any date of transfer   PID   Cannot Be Shiny 
Can Be Shiny   Games   Let's Go Pikachu & Eevee   Nature   Random   Card Per Save   Multiples Allowed                                                               
  Lv. 1 to 40       Moves   (ITALIC means Relearnable)   (None)   (None)   (None)   (None)

   (no ribbons)  OT Name    Nickname   LANG  (recipient)    (default name)   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  Format Ver.1.0.6-3, Post Updated Date:20190105_0509

Transferring Melmetal from Pokémon Go to Let's Go Pikachu and Lets Go Eevee is the only way for the games to receive Melmetal, as this Pokémon cannot be in encountered in those games. Additionally, this Pokémon cannot be evolved from Meltan in those games.
The Original Trainer for Pokémon Go was changed for privacy purposes.
Additionally, this page also holds a shiny Melmetal captured and evolved by @wo0ts during the Lunar New Year Event (2019).
During the Lunar New Year Event (2019) in Pokémon Go, shiny Meltan has a chance of appearing from using the Mystery Box, duration listed below.

The cool down between box usage were temporarily reduced to 3 days instead of the standard 7 days.

The event runs from February 5th, 2019 to March 4th, 2019, and this marks the first time shiny Melmetal has been made available to players. 
   Go Park Transfer  Species   Melmetal   TID   (recipient)   Distribution   Pokemon Go   Location   GO Park complex   Dates   Any date of transfer   PID   Cannot Be Shiny 
Chance of Shiny   Games   Let's Go Pikachu & Eevee   Nature   Random   Card Per Save   Multiples Allowed                                                               
  Lv. 1 to 40       Moves   (ITALIC means Relearnable)   (None)   (None)   (None)   (None)

   (no ribbons)  OT Name    Nickname   LANG  (recipient)    (default name)   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  Format Ver.1.0.6-3, Post Updated Date:20190105_0509

In Pokémon Colosseum, when the player starts a new game, these Pokémon will already be part of the player's party.

In Pokémon Colosseum, after the player rescues the character Duking's Plusle, Duking will then proceed to give the Plusle to the player.

A basic reader that can read normal_encount and dai_encount file, that is the file that controls event/promoted raids.

To extract such a file from your save, read up on this page.
 
Not much features, and I don't really plan to add much. Besides species, chance, game, tiers, and possibility of shiny (0 is shiny allowed, 2 is forced shiny) what else is there to add, hmm?

Note - Refers to no. of attacks. It appears to be the number of moves the mon makes per turn, beyond the Dmax/Gmax move.

Note that drop_rewards/bonus_rewards presently not supported properly, and I have no intention for it to be supported properly.

This page hosts the shadow and purified versions of the Shadow Lugia obtained during the narrative of XD: Gale of Darkness.
More Colosseum and XD Pokémon can be found at this page.
 
Some images:

This event was distributed to those who purchased a 20th Anniversary Pokemon Clear 2DS (Red/Blue/Green/Yellow) from Japan,
that came bundled with a collection ticket see screenshot area.
The device also comes with a code card for a Serial Code for Mew, a code card for the respective theme, themed stickers , and pre-loaded with the Virtual Console title.
The ticket would have to be taken to a participating Pokemon Center in Japan, in order to receive the Mew via trade.

As the DVs (Gen I IVs) are distributed with 15 in every slot,
it is not possible to obtain this as a Shiny when transferred normally through Pokemon Transporter.

This PK1 file will only be compatible with JPN version of the game.

THIS MEW IS LEGAL FOR VIRTUAL CONSOLE,
AND CAN BE TRANSFERRED UP TO GEN 7 AND ONWARDS.
Games Virtual Console, Red, Green, Blue & Yellow. Type Trade Dates March 19 to May 8, 2016
(any date when received from Transporter) Nickname (default) OT ゲーフリ TID 22796 Moves Pound (None) (None) (None)
This is a video of my friends helping me to collect the Mew event!
(audio got muted by youtube due to proprietary song playing in the background)
 

Maybe you've did some glitch and got stuck in a map? Maybe you've edited the map coordinates and somehow it went wrong?

This tool aims to fix it. This tool will warp you to a somewhat starting area.
Note: Only for DP, Pt, XY, ORAS, SM, USUM
Note 2: Kinda works for DP and Pt. Gen 4 recognition depends on a) having either Male or Female gender b) the journey was started with one of the proper starters.

Instructions:
0. Keep a safe backup of your save. This program will not create a backup.
1. Launch the program
2. Open/drag&drop the save onto the open window
3. Press the Inject button
4. Close the program
5. Now open PKHeX, drag your save into it
6. Save the progress in PKHeX (should fix the checksums)
7. Now restore the save back into your game, and launch the game :3
8. When the game loads properly, but you're in black screen, enter the Bag/Pokédex/Party to reload the map of the overworld. To fix NPCs, enter and exit a building.

Background
I was looking for a Pokémon Channel (PAL) save, as I thought the gameplay portion to get to Jirachi,
is just so freaking long. Hence, I decided to scour the internet for a save!

Crediting Internal Saves
NinFanBoyFTW's saves:
Pokemon Colosseum and Pokemon XD

theSLAYER's saves:

SkyLink24's save (link):
 
Crediting External Saves
Any saves that I obtain from the internet or from users, will be credited here.

Pokémon Channel (PAL and US) from batwing321 on Gamefaqs (link)
Pokémon Colosseum (JP) from @suloku, posted on Gamefaqs (link)
Pokémon Colosseum (PAL) from @suloku and richardj0612, posted on Gamefaqs (link)
Pokémon Colosseum (US) from thegreekweezel, SonikFire and wildgoosespeeder, posted on Gamefaqs (link)
Pokémon XD - Gale of Darkness (US) from TrapperKeeperX, post on Gamefaqs (link)

This gift was traded to players during a Christmas Celebration.

Players will select Gengar or Scizor, and the a Haunter or Scyther (w/ Metal Coat) is traded to the players,
and it will evolve upon receiving it.

This page also includes a simulated card, for the Haunter and Scyther.

The Christmas Lucky Egg code can also be received at this event.

It appears this trade event had a season 2 due to popular demand.

This event was distributed via Nintendo Zones at Pokemon Centers and Pokemon Store outlet in Japan.
This marks the first time Diancie is obtainable shiny.
 Species   Diancie   Nickname   (default, save lang)   OT   ポケセン   TID   12125   Distribution   Nintendo Zone   Location   a Pokémon Center   Dates   Dec 12 to Dec 31, 2015   PID   Shiny PID   Games   JP 3DS: ORAS    Lv. 50      Nature   Random   Ability   Clear Body (1)   Item   Normal Gem 
Classic   Moves   (ITALIC means Relearnable)   Diamond Storm   Moonblast   Reflect   Return   WC ID 131: 「いろちがいのディアンシー　プレゼント」's receiving text  0x07 Thank you for coming to the Pokémon Center! Please pick up your gift from the delivery girl in the game. いろちがいのディアンシー　プレゼント ポケモンセンターから　かんしゃを　こめて
とっておきの　プレゼント！
いままで　だれも　みたことのない
いろちがいのディアンシーを　プレゼント！

This Gardevoir is based on the Chymia's Gardevoir in the Volcanion and the Mechanical Marvel movie.
 
 Species   Gardevoir   Nickname   (default, save lang)   OT   キミア   TID   06176   Distribution   Serial Code   Location   Pokémon Movie 16   Dates   Jun 17 - Aug 31, 2016   PID   Shiny PID   Games   JP 3DS: XYORAS    Lv. 50      Nature   Random   Ability   Synchronize (1)   Item   Gardevoirite 
Wishing   Moves   (ITALIC means Relearnable)   Dazzling Gleam   Moonblast   Stored Power   Calm Mind   WC ID 168: 「キミアの　いろちがいのサーナイト」's receiving text  0x35 Thank you for receiving this distribution! Please pick up your gift from the delivery girl in any Pokémon Center. キミアの　いろちがいのサーナイト アゾットおうこくの　おうじょ　キミアは
だいじん　ジャービスの　ことを
ふしんに　おもい　ひそかに
ちょうさを　すすめている。
かのじょとともに　たたかう　サーナイトの
かつやくを　えいがかんへ　みにいこう！

Species   Ho-Oh   Nickname   (default, save lang)   OT   ＰＣキョウト   TID   03166   Distribution   Local Wireless   Location   a Pokémon Center   Dates   Mar 15 to May 08, 2016   PID   Shiny PID   Games   All Regions 3DS: ORAS                                                                Lv. 50    Nature   Random   Ability   Pressure (1)   Item   Sacred Ash   Card Per Save   Only One Allowed    Moves   (ITALIC means Relearnable)   Sacred Fire   Brave Bird   Recover   Celebrate   WC ID 164: 「ＰＣキョウト　オープンきねん」's receiving text 0x07 Thank you for coming to the Pokémon Center! Please pick up your gift from the delivery girl in the game.

Souvenir ＰＣキョウト　オープンきねん ポケモンセンターキョウトの
オープンを　きねんして
いろちがいの　ホウオウを　プレゼント！
ぜひ　きょうとに　あそびにきてね！ Format Ver.1.0.6-2, Post Updated Date:20180411_1615

This gift was distributed to players who pre-ordered tickets to M08: Lucario and the Mystery of Mew.
Players could use the tickets to obtain the Mew from June 25 to August 31, 2005.

These Arceus were distributed to players who attended the Movie Hoopa and the Clash of Ages via Serial code,
which features a random chance to get one out of all types of Arceus (via different item Silk Scarf for Normal, Plates for types),
or a shiny Arceus.
 
 Species   Arceus   Nickname   (default, save lang)   OT   デセルシティ   TID   03075   Distribution   Serial Code   Location   Pokémon Movie 15   Dates   Mar 07 to Aug 31, 2015;  Nov 20 to Dec 17, 2015   PID   Cannot Be Shiny   Games   JP 3DS: XYORAS    Lv. 100      Nature   Random   Ability   Multitype (1)   Item   Silk Scarf 
Wishing   Moves   (ITALIC means Relearnable)   Judgment   Blast Burn   Hydro Cannon   Earth Power   WC ID 81: 「アルセウス　プレゼント」's receiving text  0x03 Thank you for coming to see the 2015 Pokémon Movie! Please pick up your gift from the delivery girl in any Pokémon Center. アルセウス　プレゼント ことしの　ポケモンえいがに　とうじょうする
アルセウスを　プレゼント！
もっている　どうぐによって
タイプが　ちがうぞ！

This page has the Pokemon FireRed and LeafGreen Version of the Aurora Ticket.
This wonder card cannot be used for Pokemon Emerald Version.


Original Thread and Credits!

When you only have one Pokémon, which is the one that is in your party, this NPC in Cianwood will give you a Tentacool.
It is not necessary to remove Surf/Fly from your remaining party member.
This can be done during any part of the story, including after defeating the Elite 4 and Champion.



The NPC will continue to give out Tentacool infinitely, as long as you only have one Pokémon.
Able to be of either gender or either ability.

This will be a RNG Tool for all main Pokémon games generations 3-7. It currently supports parts of generation 3.
PokéFinder is a cross platform RNG tool that is coded from my knowledge of Pokémon games and inspired by parts of RNG Reporter, GameCubeRNG, PPRNG(eventually), and 3DSRNG Tool(eventually) and currently has the following features:
Gen 3 RNG(Stationary; including Gales/Colo/Channel, Wild)
  Credits (as per github)
Bill Young, Mike Suleski, and Andrew Ringer for RNG Reporter
chiizu for PPRNG
wwwwwwzx for 3DSRNG Tool
Pokémon researchers(OmegaDonut, Bond697, Kaphotics, Zari, amab, etc)
Sans for designing the GUI
 
Note: Always check their github, as it may have the latest version

100x Poke Balls distributed via Serial code, for purchasing the Dual Pack Retail Copies of Pokemon Sun and Pokemon Moon.
Event was Available to US, KO and JP
WC 1603: ダブルパック　こうにゅうとくてん Poke Ball
        x 100 0x2C Thank you for playing Pokémon! Please pick up your gift from the deliveryman in any Pokémon Center.             Serial Code  |  Nov 18, 2016 to Nov 30, 2017  |  JP: SM ダブルパック　こうにゅうとくてん やせいの　ポケモンに　なげて
つかまえる　ための　モンスターボールを
１００コ　プレゼント！
このボールで　たくさんの　ポケモンを
つかまえよう！

This Pikachu was distributed to HKTW players with Pokemon ORAS.
Only English wonder card, via TW, EU and JP units.
 
 Species   Pikachu   Nickname   (default, save lang)   OT   Satay King   TID   08095   Distribution   Serial Code   Location   a lovely place   Dates   Aug 09 to Sep 30, 2015   PID   Cannot Be Shiny   Games   TW via EU, EU, JP: ORAS    Lv. 10      Nature   Random   Ability   Static (1)   Item   Sweet Heart 
Special   Moves   (ITALIC means Relearnable)   Play Nice   Charm   Nuzzle   Sweet Kiss   WC ID 109: 「Pokémon x Satay King's Pikachu」's receiving text  0x2C Thank you for coming to the store! Please pick up your gift from the delivery girl in any Pokémon Center. Pokémon x Satay King's Pikachu Pokémon x Satay King Grand Opens!
Distributing Pikachu as a gift!
Don't miss the chance♪

This Kangaskhan was distributed to HKTW players with Pokemon ORAS.
Only English wonder card, to EU units, TW units and JP units.
 
 Species   Kangaskhan   Nickname   (default, save lang)   OT   2015 Spring   TID   04035   Distribution   Serial Code   Location   a Pokémon Center   Dates   Apr 03 to 09, 2015   PID   Cannot Be Shiny   Games   TW via EU, EU, JP: ORAS    Lv. 50      Nature   Random   Ability   Scrappy (2)   Item   Kangaskhanite 
Classic   Moves   (ITALIC means Relearnable)   Fake Out   Return   Earthquake   Sucker Punch   WC ID 89: 「Getting Kangaskhan in spring!」's receiving text  0x07 Thank you for coming to the Pokémon Center! Please pick up your gift from the delivery girl in the game. Getting Kangaskhan in spring! To celebrate spring holiday,
Kangaskhan will be given to
you as a gift!