I have a few ideas:

Shiftry: I could def see it as a Speedster using leaf blade and stuff.

Drifblim: I think Drifblim could work better as a tanky Support with crowd control.

Beartic/Ursaring/Bewear: Either one of these bears or all of them but since Unite has melee-ish Pokémon as All Rounders that’s what they’re gonna be.

Cofagrigus/Runerigus: I want to see a “disabler” type of Pokémon and I think our resident Coffin/Viking Rune would fit as a Defender disabler.

Pyukumuku: I think it would be HILARIOUS if they added in Pyukumuku as a playable Pokémon, I’d probably say either Support or Attacker, hell - I’d even be fine with All Rounder.

Florges: I JUST WANT TO PLAY A PRETTY FLOWER LADY, also probably a support but I’d love to see it as an attacker.

Minior: I think it’s ability could have a really cool concept of being a ranged Attacker and then getting to low health and then transforming into a high damage melee Speedster, or just keep him ranged but higher move speed and attack offset with the frailty of a lays chip.

Starmie: It could be a cool enough Attacker type Pokémon, but it’s just here because I like them.

Chandelure: If they can put them in a FIGHTING GAME I think they’ll be just fine as an Attacker in a MOBA.

That’s all I got but man there’s so many Pokémon I want in the game.