We all start our adventure picking one of three types: grass, water, or fire. We pick one, and stick with it until we get more. But what then? Do you keep it on your team? Do you box it away forever? Do you raise it to rediculous levels as your sole team member?
I for one, always use my starter, despite how bad they may be (I'm looking at you serperior.) I put it on a team with 3-5 others of various types, which all eventually get migrated to another generation. If they're good enough, I'll use them in online battles.