[It doesn't make sense because it... really just doesn't. Creatures shouldn't completely change forms in a blink, without a serious metamorphosis like what happens in between caterpillar and butterfly. Hijikata isn't a biologist, however, and used to magic and science being able to accomplish just about anything, so he confidently shares what knowledge he possesses.]

It depends. My two just evolved when they were ready after enough experience and training, but there are pokémon that require special items. I'm pretty sure we can get those from the vending machine next to the one with the pokéballs. Ultimately it comes down to the pokémon, though. Some evolve quickly, some slowly.

[He totally parsed the way Eren meant it. What else is there other than kicking monster ass? Maken keeps its interest on the Yamask, and he can only assume that they're communicating. With their blank faces and mix of prolonged silence and really strange noises, it's hard to tell, but neither looks hostile or scared.]