Okay, i was thinking about it for a while and i think that there's one huge balancing issue in Touhoumon Blue. Namely easly obtainable, reusable and way too abusable Baton Pass. There's literaly nothing stoping players from breaking the game with Marisa/Aya + SubCM Alice for example.
Either BPass TM should be replaced by something or moved into very late game, and definitively not being purchasable in any shop. Right now any sense of challenge disappears after stepping into Celadon Dept. Store.