@Dusksong Lab assistant sounds good, your chara will get along with a certain one of mine that way (Amber's probably going to assist Professor Bonsai with field work at some point).
At this point we can start off with up to 3 Pokemon, lv10 or under. Though if you have an evolved one, or one that doesn't evolve, it's probably best to just have the one Pokemon for now.
As for called Pokemon, it's fine to have one somebody else has called as long as you ask them first. I'm sure Heckno would be fine with it if your chara also had a Tyranitar, just ask him. (Just so you know, if you want any of the ones I've called, that's ok.)
@AbysmalDemon Welcome back! Right now, everyone's in the ambulance. The second ambulance. The first never made it to Mesalon. We didn't know if you were going to come back, so we went with your character stayed behind... trust me, that's a good thing.
You could travel to Mesalon after the time skip and catch up with us.