Title says most of it, just predict what Mons the GLs so far will have, preferably using Pokémon likely or confirmed to be available. Genuine predictions, not wants.
Available Pokémon so far:
https://www.serebii.net/swordshield/galarpokedex.shtmlInfo:
Milo:
>Grass>2 Pokemon>Probably 1st Gym>Ace is a Level 19 Dynamax EldegossNessa:
>Water>3 Pokemon>Probably 2nd Gym>Ace is a Level 24 Dynamax Drednaw>Goldeen in demo but number of Pokémon and Level was inconsistent with in-game screenshotsBea:
>Fighting >Unknown Pokemon and Gym number >Ace not confirmed but has a Hitmontop of an unknown level>Sword Only, Allister's counterpart Allister:
>Ghost>Unknown Pokemon and Gym number >Ace not confirmed but has a Mimikyu of an unknown level>Shield Only, Bea's counterpart 