I'd like to be a trainer, but probably only for the region I was born in--unless it's something like Johto and Kano, in which case, I would easily do that (I can't see myself taking to going overseas very well). It'd be interesting to just travel that particular region and get to see the different towns that inhabit the region/continent I live on. I've always liked the idea of challenging gym leaders and entering the League. But of course, I can see myself doing Contests, so on the plus-side of being a trainer, I can be a Coordinator. Who says you can't be both, you know?
But otherwise, since it's not required to go on a journey, if I don't do it, I'd like to have one Pokémon as a companion anyway. That way, I'd do just whatever I normally do, just with a Pokémon.