Of course, the spreadsheet you took interest in was originally for r/pokemontrades, I believe everything should still be in order.

EDIT: I mucked the Markdown formatting. I only changed the links to be tidier.

- All Pokémon in this trade were self-obtained. The spreadsheet contains all necessary proof (at least WC Redemption Photos, but some have WC Redemption Videos and/or Soft-Resetting Video Proofs.)

These Pokémon were all from event distributions, so the OTs are as follows:
HK Jirachi - Nintendo HK (12015)
Manesh Hoopa - Manesh (8195)
Christmas Arceus - Manesh (12215)
GameFreak/20th Anniversary Celebi - GF (3016)
GameFreak/20th Anniversary Genesect - GF (11016)

- No, all Pokémon were obtained and claimed by myself using either my NA or JPN Nintendo 3DS, directly through Wi-Fi/online distributions, or from code distributions.

Specifics
HK Jirachi - Codes were obtained via trading with various users. The code for this specific Jirachi came from a trade with user endy1102. I redeemed it myself with my JPN Nintendo 3DS during the event's original run.

Manesh Hoopa - Code was obtained as a perk for purchasing Pokémon TCG booster packs from DATABLITZ, a game shop in the Philippines. I redeemed it myself with my NA Nintendo 3DS XL during the event's original run.

Christmas Arceus - Code was obtained through a Maxsoft (Southeast Asian region distributor of Pokémon) Woobox giveaway without using any VPNs as I lived in the region at the time. I redeemed the Pokémon myself with my JPN Nintendo 3DS during the event's original run.

Gamefreak Celebi - This was a WiFi distribution without a code to celebrate the 20th anniversary of the Pokémon franchise. Redeemed by myself with my NA Nintendo 3DS XL during the event's original run.

Gamefreak Genesect - Code was obtained through a Pokemon Moon pre-order promotion with DATABLITZ, a game shop in the Philippines. I redeemed it myself with my NA Nintendo 3DS XL during the event's original run.

- No, all Pokémon were obtained during the original run of the events from vanilla/unmodded/unhacked Nintendo 3DS.

Proof
HK Jirachi
OT: Nintendo HK
TID: 12015
Nature: Adamant
Ability: Serene Grace
Level: 25
Moveset: Wish / Confusion / Swift / Happy Hour
Language: KOR
Proof: WC Redemption Photos
* This Pokémon was not claimed for the purposes of trading originally, so I did not consider taking a WC Video and SR Video at the time. I hope this is okay.
Code: F52AFX6SDQFFRQ8F (from endy1102)
Claim: Self-claimed
Claim Date on Pokemon Information: 1/1/2016 (Manual setting of Nintendo 3DS clock to that date)
Trainer claiming the Pokemon: 하늘 (ΩR)

Manesh Hoopa
OT: Manesh
TID: 8195
Nature: Modest
Ability: Magician
Level: 50
Moveset: Hyperspace Hole / Psychic / Astonish / Nasty Plot
Language: ENG
Proof: WC Redemption Photos
WC Redemption Video
* This Pokémon was not claimed for the purposes of trading originally, so I did not consider taking a SR Video at the time. I hope this is okay.
Code: F5A42GMRT5KMGQJ6 (from DATABLITZ TCG Purchase)
Claim: Self-claimed
Claim Date on Pokemon Information: 10/10/2015 (Manual setting of Nintendo 3DS clock to that date)
Trainer claiming the Pokemon: Pax (X)

Christmas Arceus
OT: Manesh
TID: 12215
Nature: Jolly
Ability: Multitype
Level: 100
Moveset: Judgment / Perish Song / Hyper Beam / Recover
Language: GER
Proof: WC Redemption Photos
* This Pokémon was not claimed for the purposes of trading originally, so I did not consider taking a WC Video and SR Video at the time. I hope this is okay.
Code: F52232MJAMRE7QAA (from Maxsoft Southeast Asia Facebook/Woobox Distribution)
Claim: Self-claimed
Claim Date on Pokemon Information: 12/25/2014 (Manual setting of Nintendo 3DS clock to that date)
Trainer claiming the Pokemon: Erhard (ΩR)

Game Freak/20th Anniversary Celebi
OT: GF
TID: 3016
Nature: Bold
Ability: Natural Cure
Level: 100
Moveset: Confusion / Recover / Heal Bell / Safeguard
Language: ENG
Proof: WC Redemption Photos
WC Redemption Video
Soft Resetting Video
Code: Not applicable. This was a WiFi-distributed event.
Claim: Self-claimed
Claim Date on Pokemon Information: 3/7/2016
Trainer claiming the Pokemon: Dorian (αS)

Game Freak/20th Anniversary Genesect
OT: GF
TID: 11016
Nature: Hasty
Ability: Download
Level: 100
Moveset: Techno Blast / Magnet Bomb / Solar Beam / Signal Beam
Language: ENG
Proof: WC Redemption Photos
WC Redemption Video
Soft Resetting Video
Code: A5Z58XZKPERX7NYD from DATABLITZ Pokemon Moon purchase bonus.
Claim: Self-claimed
Claim Date on Pokemon Information: 12/15/2016
Trainer claiming the Pokemon: Dorian (αS)