Hmm... Might make bringing Flare tricky, but he's the one member on my team that can Mega Evolve.

[Riku looks to his Charizard, who grunts in affirmation, but... really, they gotta do what's best for their circumstances. Flare doesn't mind taking a step back if need be.]

Come to think of it, Ground types would probably be perfect for the environment. And Ghost types can phase through walls, so that could help with environmental hazards...