Eren has never had a pet or anything. Yamask is a lot less work than, say, a cat or dog. It's probably less work than some other Pokemon, really, but Eren has never acquired a second one so he doesn't know. Reiner has one, but she's not much work either.

"It likes berries," he says. He doesn't even know about Pokemon specific berries! He just knows that whenever he has berries, Yamask always wants some.

He looks down at Mecchan. Eren is probably intimidating on accident, but he doesn't mean to be.

"I wonder why he's so scared," he says. "Sounds like he should learn from Hina."