It's likely that, no matter what you add to that team, you will never get a good team out of it. If you're playing in-game only, add whatever you like because none of it is a challenge. If you intend to actually play real people who know anything about pokemon, start fresh with a real team, not a bunch of whatever stuck together.
and why are you suggesting Lapras as a fast pokemon? It's not about to outspeed much without using priority moves or speed boosting :/