Man, I hope that Metagross is good.
It's okay. I think its ability lets you use Steven without ending your turn if its active, and the attack is 60, then deals another 60 damage the next turn.
That new stadium, if I'm interpreting it right, is like Faded town but works against ALL EX/GX instead of just megas, but only places 1 damage counter. Seems like a pretty good card.