I'd be a trainer in Hoenn, in either Rustboro, Slateport or Lilycove. Treecko would be my starter. Evolution would be amazing, but I think that it would be best to let the Pokemon decide. I'd love to be a part-time coordinator or something, but I'm probably too shy for the part. xD;
If not, I would start with a Rayquaza and make it devour my enemies.