>>46999375Poison-types, easily. I even came up with a Gym Leader idea where he's a prodigy but would rather relax and do his own thing. It's heavily implied, if not confirmed, that he only became the 8th Gym Leader just so not many Trainers would face him.
He would wear a Muk Hoodie (Because Muk's my favorite Pokemon and is his Ace) and just lounge around on a couch like a Slaking and eat snacks.