That Poké-Power would work so well in my deck...shame Swampert wouldn't, though.
130HP, great, pretty good weakness to have given the fire monkey's control over all Grass Pokémon. Retreat Cost is actually pretty good for Swampert, as you'd probably expect it to have 3. Like I said, with Wash Out, what would absolutely rock in the right circumstances. Even just running a 1-0-1 Swampert line in a deck might be a good idea if you have the room. Hammer Arm is also pretty good.
I don't know if I could give it a rating as I haven't analysed it properly yet...probably say 6 or 7 out of 10.