Metagross

After Mega Evolving, Mega Metagross is a force to be reckoned with in the Battle Spot Doubles metagame. With incredible Attack further boosted by Tough Claws, Mega Metagross is one of the hardest hitters around. It also has very good bulk, allowing it to not only have high damage output but also survive quite a few hits. It is one of the best checks to Fairy-types, resisting their STAB attacks and hitting them back with a super effective Steel-type STAB move, which usually results in an OHKO. Clear Body lets it ignore Intimidate prior to Mega Evolving, which is rather unique amongst physical attackers. Unfortunately, it also gets hard countered by some of the most common Pokemon in the metagame, namely Heatran, Aegislash, and Bisharp, which all resist both its STAB attacks and can hit it back with their super effective STAB move. Mega Metagross has many coverage options, but it can't fit more than one of them into a set, as dual STAB moves and Protect are necessities.