Aether:

• Espeon/Umbreon (depending on starting gender)
• Cosmog

Lumine:

• Espeon/Umbreon
• Cosmog

Paimon:

• Igglybuff

Tartaglia/Childe/Ajax:

• Clawitzer
• Wailord

Arlecchino:

• Bisharp
• Crobat

Capitano:

• Absol
• Aegislash/Corviknight/Kleavor/Ceruledge
• Nidoking
• Kabutops
• Garchomp

Katheryne:

• Indeedee

Mondstadt!

Venti (Flying Champion):

• Chatot (Ace)

Jean (Normal? Elite Four):

Barbara (Water? Elite Four):

• Blissey
• Jigglypuff?
• Swanna
• Milotic?

Klee (Fire Elite Four):

• Foretress
• Turtonator
• Magmortar
• Darmanitan
• Emboar

Lisa (Electric/Psychic Gym Leader):

Diluc & Kaeya (Fire/Ice Gym Leader Duo):

• Ninetales (D)
• Alolan Ninetales (K)

Albedo (Rock Gym Leader):

Rosaria (Ice/Dark Gym Leader):

• Weavile

Eula (... Gym Leader):

Amber (Fire Rival):

• Scorbunny/Charmander

Mona:

Diona:

Razor:

• Luxray

Bennett:

Noelle:

Fischl:

• Corviknight

Sucrose:

Mika:

Liyue!

Zhongli (Ground Champion):

• Tyranitar

Ningguang (Rock Elite Four):

• Gigalith

Xiao (Dark Elite Four):

• Absol

Keqing (Electric Elite Four):

Ganyu (Ice Elite Four):

• Froslass

Beidou (Water Gym Leader):

• Eelektross

Xingqiu (Steel Gym Leader):

Qiqi (Ghost Gym Leader):

Yanfei (Fire Gym Leader):

Yelan (Flying/Water Gym Leader):

Hu Tao

• Haunter

Chongyun:

Xiangling:

• Teddiursa

Xinyan:

Shenhe:

Yun Jin:

Yaoyao:

Gaming:

Xianyun:

Baizhu:

Lan Yan:

Inazuma!

Raiden Shogun/Ei (Electric Champion):

Yae Miko (Electric/Ghost Elite Four):

• Misdreavus
• Ninetales?
• Jolteon/Espeon
• Fennekin?
• Raikou (rerun Elite Four)

Kujou Sara (Flying Elite Four):

• Decidueye

Kamisato Ayaka (Ice Gym Leader Duo):

Kamisato Ayato (Water Gym Leader Duo):

Arataki Itto (Rock/Fighting Gym Leader):

Gorou (Fighting/Ground/Flying Gym Leader):

Kuki Shinobu (Dark Gym Leader):

Shikanoin Heizou (Psychic Gym Leader):

Sangonomiya Kokomi (Fairy Gym Leader):

Kaedehara Kazuha:

Sayu:

Thoma:

Kirara:

Sumeru!

Nahida (Grass Champion):

Alhaitham (Normal/Psychic Elite Four):

Dehya (Fire/Fighting Elite Four):

• Infernape
• Emboar
• Blaziken
• Cinderace
• Primeape

Tighnari (... Gym Leader):

• Parasect

Dori (Ghost Gym Leader):

Cyno (Electric Gym Leader):

Candace (Steel Gym Leader):

Nilou (Water Gym Leader):

• Ludicolo

Collei (Grass Rival):

Layla:

• Froslass

Wanderer:

• Pawniard

Faruzan:

Kaveh:

Sethos:

Fontaine!

Furina & Neuvillette (Dual Champions):

• Samurott (N)
• Primarina (F)

Wriothesley (Ice Elite Four):

• Avalugg

Navia (Ground/Steel Gym Leader):

• Bastiodon
• Mawile

Lyney & Lynette (Psychic/Dark ...):

• Umbreon (ey)
• Espeon (ette)

Freminet (Water Rival):

• Piplup

Charlotte:

Chevreuse:

Chiori:

Clorinde:

Sigewinne:

Emilie:

Natlan!

Mavuika (Fire Champion):

• Talonflame

Xilonen:

Kinich:

• Porygon (any of em)

Iansan:

Mualani:

• Primarina

Chasca:

Ororon:

• Noibat

Kachina (Ground Rival):

• Trapinch

Citlali: