So your looking for a water pokemon that can attack for colorless energy? Why not use Aquapolis Suicune? You don't even need water energy then. Just use multi-energy, count it as water, then put grass on it. Now, I dunno the rules, but I think it would not make you discard an energy card if you lay a multi energy card on him. That way you can do 30 damage and it's a basic. Takes up less space.