Well, again, my specific team has no way of dealing with Metagross. (I know, sad). So Moltres/Zard I think personally are great counters to him since they are immune to EQ, have a 4x resist on Meteor Mash/BP, and can OHKO with Fire Blast.
(And if the opposing team were to send in TTar, I would probably just switch out to my Scarf E-Vire if I predict it would DD, or even Pert, if I think it would Sub)