Hi peeps,
Im going with TylerM on this one, Metagross/Deoxys EX (attack) is just so speedy in setting up and dealing big damage fast! Also, running this deck with some Ludicolos (the rare one with Happy Dance) ensures one does not get and damage done by Metagross's poke-power (Super Connectivity). Thus this combines speed, big damage and a little healing going.
Cephiro