((Keep in mind when I list teams, you may battle them at a younger evoulotion earlier in the game, and I'm just listing what pokemon each of them have in the endgame.))

Team cake admins:

Suisy
Nickname: Suisy Quack

Team:
Swanna: Air slash, Fly, Rain Dance, Surf

Dingchic: Psychic, Dig, Howl, Snarl

Benny
Nickname: Benny Boop

Team
Tentacruel: Constrict, Posion Sting, Hex, Water Pulse

Hellphin: Blowhole, Shadow Ball, Dark pulse, Ice charge

Lee
Nickname: Bear Lee

Team
Ursaring: Thrash, Hammer Arm, Earthquake, Work Up

Treeheft: Axe swing, Brutal Swing, Roar, Glare

And the main leader...

Dr. Frosting! ....that red stuff is cherry frosting, he says.

Team
Alcreamie: Dazzling gleam, Recover, Acid Armor, Hyper Beam

(Gigantamax) Tropius: Leaf Storm, Air Slash, Earthquake, Synthesis

Miltank: Rollout, Milk Drink, Body Slam, Zen Headbutt

Slurpuff: Play Rough, Copycat, Energy Ball, Protect

Vanilluxe: Blizzard, Rest, Sleep Talk, Self Destruct

🌟Pancaktic: Syrup Shot, Dragon Pulse, Moonblast, Heat Wave

"Bake the future! Make the future! But eat your own- *show ends*" -Him

And this is him, when he's possessed by the legendary for pokemon fallen (deviousis):

His pokemon get +1 stat buffs when you battle him like this.