@Dusksong Ooh, yes, I could write Ella's Inkay losing a bunch of CP each turn. And yeah, now Leisy's a skilled trainer, she can use status and other non-damaging moves.
Embarrassing fact about the way I play Pokémon: I got into the anime around the same time as I did the games, and now I say all the Pokémon's names in the same pitches as their cries :P
I seem to recall Larvitar being able to learn Bite. In fact, I know it can for a fact. So why is that an issue? Pokemon learn moves that don't match their typing all the time. Pound and Froakie, Scratch and Charmander, Dragon Claw, and Charizard.