I think you need to sneak a couple shaymin in as well. It seems like a good draw when Vileplumed.
That is a big adjustment. Why not add new Jolteon? Wouldn't this make M Sceptile electric?
Could it not just Break the rules of evolution? i.e. Allow Pokemon to evolve first turn/after already evolving?
My other initial thought is breaking an evolution- as in going away. Couple ideas on this:
1- When you knock out a break evolution, just the evolution goes away- no prize is drawn...