All of You, Get Out! Except You, You Stay - Tough decision

Waterfall can stay too, he's pretty cool.

Fly is bad. It is a 2 turn attack, meaning your opponent can easily switch to another Pokemon that can easily resist the attack like Steelix.

And Normal attacks in general don't see much competitive play unless they are really good, and Strength is mediocre. Any Pokemon that knows Strength should be better off using Return.