theSLAYER

This gift was distributed at the Gotta catch 'em all! STATION in Pokémon Center New York between October 25 to 31, 2003.
Level 50 and Level 100 Pokémon were distributed, so that players could use them straight away at the Battle Tower.

This gift was distributed at the Gotta catch 'em all! STATION in Pokémon Center New York between September 29 to October 3, 2003.

This gift was distributed at the Gotta catch 'em all! STATION in Pokémon Center New York between September 29 to October 3, 2003.

This gift was distributed at the Gotta catch 'em all! STATION in Pokémon Center New York between September 29 to October 3, 2003.

This gift was distributed at the Gotta catch 'em all! STATION in Pokémon Center New York between September 29 to October 3, 2003.

This gift was distributed at the Gotta catch 'em all! STATION in Pokémon Center New York on December 25, 2003.

This gift was distributed to players who attended the Party of the Decade at Bryant Park, New York, back in 2006,
to commemorate the 10th anniversary of Pokémon (based on the original Japanese release).  
While this gift is similar to the Journey Across America version, with the Original Trainer being 10 ANIV,
the Trainer ID is 06808 (signifying the event date 2006 August 8.) instead of the TID of 00010.

This gift was distributed to players who attended the Party of the Decade at Bryant Park, New York, back in 2006,
to commemorate the 10th anniversary of Pokémon (based on the original Japanese release).  
While this gift is similar to the Journey Across America version, with the Original Trainer being 10 ANIV,
the Trainer ID is 06808 (signifying the event date 2006 August 8.) instead of the TID of 00010.

This gift was distributed to players who attended the Party of the Decade at Bryant Park, New York, back in 2006,
to commemorate the 10th anniversary of Pokémon (based on the original Japanese release).  
While this gift is similar to the Journey Across America version, with the Original Trainer being 10 ANIV,
the Trainer ID is 06808 (signifying the event date 2006 August 8.) instead of the TID of 00010.

This gift was distributed to players who attended the Party of the Decade at Bryant Park, New York, back in 2006,
to commemorate the 10th anniversary of Pokémon (based on the original Japanese release).  
While this gift is similar to the Journey Across America version, with the Original Trainer being 10 ANIV,
the Trainer ID is 06808 (signifying the event date 2006 August 8.) instead of the TID of 00010.

This gift was distributed to players who attended the Party of the Decade at Bryant Park, New York, back in 2006,
to commemorate the 10th anniversary of Pokémon (based on the original Japanese release).  
While this gift is similar to the Journey Across America version, with the Original Trainer being 10 ANIV,
the Trainer ID is 06808 (signifying the event date 2006 August 8.) instead of the TID of 00010.

This gift was distributed to players who attended the Party of the Decade at Bryant Park, New York, back in 2006,
to commemorate the 10th anniversary of Pokémon (based on the original Japanese release).  
While this gift is similar to the Journey Across America version, with the Original Trainer being 10 ANIV,
the Trainer ID is 06808 (signifying the event date 2006 August 8.) instead of the TID of 00010.

This gift was distributed to players who attended the Party of the Decade at Bryant Park, New York, back in 2006,
to commemorate the 10th anniversary of Pokémon (based on the original Japanese release).  
While this gift is similar to the Journey Across America version, with the Original Trainer being 10 ANIV,
the Trainer ID is 06808 (signifying the event date 2006 August 8.) instead of the TID of 00010.

This gift was distributed to players who attended the Party of the Decade at Bryant Park, New York, back in 2006,
to commemorate the 10th anniversary of Pokémon (based on the original Japanese release).  
While this gift is similar to the Journey Across America version, with the Original Trainer being 10 ANIV,
the Trainer ID is 06808 (signifying the event date 2006 August 8.) instead of the TID of 00010.

This gift was distributed to players who won a lucky draw, and could redeem it when they attended the SpaceWorld 1999.
Big thanks to @Afepoke for helping us preserve this rare Mew, as well as his other Japanese Gen I files!
 
Original Thread
 

This gift was distributed to players who won a lucky draw, and could redeem it when they attended the SpaceWorld 1997.
Big thanks to @Deoxyz and u/salinbreezy for helping us preserve this rare Mew!

Original Thread
 

This gift was given to players via serial code, for preordering the special package for M21: Everyone's Story.
The preorder period for the special gift is November 2nd, 2018 to December 9th, 2018.
The website claims that the serial code validity is from Movie Release date till February 28, 2019.
     Species   Lugia   Nickname   (default, save lang)   OT   후우라시티   TID   181219   Distribution   Serial Code   Location   a Pokémon movie   Dates   Dec 19, 2018 
to Feb 28, 2019   PID   Cannot Be Shiny   Games   KO 3DS: SM USUM                                                                Lv. 100    Nature   Random   Ability   Multiscale (HA)   Item   None   Bundled Item   None   Card Per Save   Only One Allowed    Moves   (ITALIC means Relearnable)   Aeroblast   Hurricane   Defog   Tailwind   WC ID 1149: 「바람의 루기아 선물」's receiving text 0x01 Thanks for coming to see the Pokémon Movie! Please pick up your gift from the deliveryman in any Pokémon Center.

Wishing 바람의 루기아 선물 1년에 1번
바람 축제에 나타나는
전설의 포켓몬 루기아
커다란 날개로 날갯짓하여
강력한 바람을 일으킨다! Format Ver.1.0.6-3, Post Updated Date:20181223_1720

This gift was given to players via serial code, for ordering movie tickets for M21: Everyone's Story.
     Species   Zeraora   Nickname   (default, save lang)   OT   후우라시티   TID   181219   Distribution   Serial Code   Location   a Pokémon movie   Dates   Dec 19, 2018 
to Feb 28, 2019   PID   Cannot Be Shiny   Games   KO 3DS: USUM                                                                Lv. 50    Nature   Random   Ability   Volt Absorb (1)   Item   Air Balloon   Bundled Item   None   Card Per Save   Only One Allowed    Moves   (ITALIC means Relearnable)   Plasma Fists   Thunder Punch   Close Combat   Thunder   WC ID 1148: 「환상의 포켓몬 제라오라」's receiving text 0x01 Thanks for coming to see the Pokémon Movie! Please pick up your gift from the deliveryman in any Pokémon Center.

Wishing 환상의 포켓몬 제라오라 고속으로 이동하는 모습은
마치 번개와도 같다…
플라스마피스트로 상대에게
짜릿한 일격을 퍼부어라! Format Ver.1.0.6-3, Post Updated Date:20181223_1708

This gift was given away to participants of the 2018 International Challenge (November).
Participants were required to take part in at least 3 battles of the Online Competition, with a game synced game and account.
The serial code will then be released to players around 2 weeks after the battles finished, via their PGL account.
As this Online Competition was only available to Ultra Sun and Ultra Moon, the gift is also only receivable on Ultra Sun and Ultra Moon.
   Species   Tapu Lele   Nickname   (default, save lang)   OT   아칼라   TID   181130   Distribution   Serial Code   Location   the PGL   Dates   Dec 18, 2018 
to Jan 31, 2019   PID   Shiny PID   Games   KO 3DS: USUM                                                                Lv. 60    Nature   Random   Ability   Psychic Surge (1)   Item   Psychic Seed   Bundled Item   None   Card Per Save   Only One Allowed    Moves   (ITALIC means Relearnable)   Nature's Madness   Extrasensory   Flatter   Moonblast   WC ID 1633: 「색이 다른 카푸나비나 선물」's receiving text 0x38 This is a gift from the Pokémon Global Link! Please pick up your gift from the deliveryman in any Pokémon Center.

Classic 색이 다른 카푸나비나 선물 인터넷 대회 참가 기념으로
희귀한 색이 다른 카푸나비나를
선물합니다! Format Ver.1.0.6-3, Post Updated Date:20181218_1944

This gift was given away to participants of the 2018 International Challenge (November).
Participants were required to take part in at least 3 battles of the Online Competition, with a game synced game and account.
The serial code will then be released to players around 2 weeks after the battles finished, via their PGL account.
As this Online Competition was only available to Ultra Sun and Ultra Moon, the gift is also only receivable on Ultra Sun and Ultra Moon.
   Species   Tapu Lele   Nickname   (default, save lang)   OT   アーカラ   TID   181130   Distribution   Serial Code   Location   the PGL   Dates   Dec 18, 2018 
to Jan 31, 2019   PID   Shiny PID   Games   JP 3DS: USUM                                                                Lv. 60    Nature   Random   Ability   Psychic Surge (1)   Item   Psychic Seed   Bundled Item   None   Card Per Save   Only One Allowed    Moves   (ITALIC means Relearnable)   Nature's Madness   Extrasensory   Flatter   Moonblast   WC ID 1633: 「いろちがいの　カプ・テテフ　プレゼント」's receiving text 0x38 This is a gift from the Pokémon Global Link! Please pick up your gift from the deliveryman in any Pokémon Center.

Classic いろちがいの　カプ・テテフ　プレゼント インターネットたいかい　さんかきねんに
めずらしい　いろちがいの　カプ・テテフを
プレゼント！ Format Ver.1.0.6-3, Post Updated Date:20181218_1943

This gift was given away to participants of the 2018 International Challenge (November).
Participants were required to take part in at least 3 battles of the Online Competition, with a game synced game and account.
The serial code will then be released to players around 2 weeks after the battles finished, via their PGL account.
As this Online Competition was only available to Ultra Sun and Ultra Moon, the gift is also only receivable on Ultra Sun and Ultra Moon.
   Species   Tapu Lele   Nickname   (default, save lang)   OT   Akala   TID   181130   Distribution   Serial Code   Location   the PGL   Dates   Dec 18, 2018 
to Jan 31, 2019   PID   Shiny PID   Games   US & EU 3DS: USUM                                                                Lv. 60    Nature   Random   Ability   Psychic Surge (1)   Item   Psychic Seed   Bundled Item   None   Card Per Save   Only One Allowed    Moves   (ITALIC means Relearnable)   Nature's Madness   Extrasensory   Flatter   Moonblast   WC ID 1633: 「Tapu Lele variocolor de regalo」's receiving text 0x38 This is a gift from the Pokémon Global Link! Please pick up your gift from the deliveryman in any Pokémon Center.

Classic Tapu Lele variocolor de regalo Aquí tienes tu premio por haber participado
en el Torneo en Línea. ¡Disfruta de este
Tapu Lele variocolor tan especial! Format Ver.1.0.6-3, Post Updated Date:20181218_1941

This gift was given away to participants of the 2018 International Challenge (November).
Participants were required to take part in at least 3 battles of the Online Competition, with a game synced game and account.
The serial code will then be released to players around 2 weeks after the battles finished, via their PGL account.
As this Online Competition was only available to Ultra Sun and Ultra Moon, the gift is also only receivable on Ultra Sun and Ultra Moon.
   Species   Tapu Lele   Nickname   (default, save lang)   OT   Akala   TID   181130   Distribution   Serial Code   Location   the PGL   Dates   Dec 18, 2018 
to Jan 31, 2019   PID   Shiny PID   Games   EU 3DS: USUM                                                                Lv. 60    Nature   Random   Ability   Psychic Surge (1)   Item   Psychic Seed   Bundled Item   None   Card Per Save   Only One Allowed    Moves   (ITALIC means Relearnable)   Nature's Madness   Extrasensory   Flatter   Moonblast   WC ID 1633: 「Un Tapu Lele cromatico in regalo」's receiving text 0x38 This is a gift from the Pokémon Global Link! Please pick up your gift from the deliveryman in any Pokémon Center.

Classic Un Tapu Lele cromatico in regalo Ecco la ricompensa per aver partecipato
alla Gara Online! Divertiti a lottare insieme
a questo rarissimo Tapu Lele cromatico! Format Ver.1.0.6-3, Post Updated Date:20181218_1940

This gift was given away to participants of the 2018 International Challenge (November).
Participants were required to take part in at least 3 battles of the Online Competition, with a game synced game and account.
The serial code will then be released to players around 2 weeks after the battles finished, via their PGL account.
As this Online Competition was only available to Ultra Sun and Ultra Moon, the gift is also only receivable on Ultra Sun and Ultra Moon.
   Species   Tapu Lele   Nickname   (default, save lang)   OT   Akala   TID   181130   Distribution   Serial Code   Location   the PGL   Dates   Dec 18, 2018 
to Jan 31, 2019   PID   Shiny PID   Games   EU 3DS: USUM                                                                Lv. 60    Nature   Random   Ability   Psychic Surge (1)   Item   Psychic Seed   Bundled Item   None   Card Per Save   Only One Allowed    Moves   (ITALIC means Relearnable)   Nature's Madness   Extrasensory   Flatter   Moonblast   WC ID 1633: 「Schillerndes Kapu-Fala als Geschenk」's receiving text 0x38 This is a gift from the Pokémon Global Link! Please pick up your gift from the deliveryman in any Pokémon Center.

Classic Schillerndes Kapu-Fala als Geschenk Hier ist die Belohnung für deine Teilnahme am
letzten Online-Turnier. Viel Spaß mit diesem
seltenen Schillernden Kapu-Fala! Format Ver.1.0.6-3, Post Updated Date:20181218_1939

This gift was given away to participants of the 2018 International Challenge (November).
Participants were required to take part in at least 3 battles of the Online Competition, with a game synced game and account.
The serial code will then be released to players around 2 weeks after the battles finished, via their PGL account.
As this Online Competition was only available to Ultra Sun and Ultra Moon, the gift is also only receivable on Ultra Sun and Ultra Moon.
   Species   Tapu Lele   Nickname   (default, save lang)   OT   Akala   TID   181130   Distribution   Serial Code   Location   the PGL   Dates   Dec 18, 2018 
to Jan 31, 2019   PID   Shiny PID   Games   US & EU 3DS: USUM                                                                Lv. 60    Nature   Random   Ability   Psychic Surge (1)   Item   Psychic Seed   Bundled Item   None   Card Per Save   Only One Allowed    Moves   (ITALIC means Relearnable)   Nature's Madness   Extrasensory   Flatter   Moonblast   WC ID 1633: 「Un Tokopiyon chromatique en cadeau」's receiving text 0x38 This is a gift from the Pokémon Global Link! Please pick up your gift from the deliveryman in any Pokémon Center.

Classic Un Tokopiyon chromatique en cadeau Voici une récompense pour votre récente
participation à la Compétition Internet !
Prenez soin de ce Tokopiyon chromatique rare ! Format Ver.1.0.6-3, Post Updated Date:20181218_1937

This gift was given away to participants of the 2018 International Challenge (November).
Participants were required to take part in at least 3 battles of the Online Competition, with a game synced game and account.
The serial code will then be released to players around 2 weeks after the battles finished, via their PGL account.
As this Online Competition was only available to Ultra Sun and Ultra Moon, the gift is also only receivable on Ultra Sun and Ultra Moon.
   Species   Tapu Lele   Nickname   (default, save lang)   OT   Akala   TID   181130   Distribution   Serial Code   Location   the PGL   Dates   Dec 18, 2018 
to Jan 31, 2019   PID   Shiny PID   Games   US & EU & TW 3DS: USUM                                                                Lv. 60    Nature   Random   Ability   Psychic Surge (1)   Item   Psychic Seed   Bundled Item   None   Card Per Save   Only One Allowed    Moves   (ITALIC means Relearnable)   Nature's Madness   Extrasensory   Flatter   Moonblast   WC ID 1633: 「Shiny Tapu Lele gift」's receiving text 0x38 This is a gift from the Pokémon Global Link! Please pick up your gift from the deliveryman in any Pokémon Center.

Classic Shiny Tapu Lele gift Here is your reward for your
participation in the recent
Online Competition!
Enjoy this rare Shiny Tapu Lele! Format Ver.1.0.6-3, Post Updated Date:20181218_1427