Rush the metagross deck. Otherwise, try to set up on the bench, and don't act if you don't ohko metagross. Once you get that first knockout, they should not be able to recover. If they already have 3 metagross, you will have problems... So go fast and take the knockout bfor they get 3.
Never tested this, but what if you tech 1-1 Garbotoxin?
Never tested this, but what if you tech 1-1 Garbotoxin?