tyranitar @ leftovers
evs: 252 hp / 76 atk/ 180 spdef
-low kick / superpower
-fire blast / stone edge
it tanks any hit (lo dm doesn't even 3hko!) and proceeds to hit back with a strong crunch or stone edge. the ev spread is chosen from the ubers analysis and it allows tyranitar to tank basically any special hit (i'm looking at you, aura sphere mewtwo) and attack back. additionally, it can trap stuff such as giratina-o (though not giratina, sadly) which allows you to spin easily. the main problem with this is that kyogre and groudon comes in for basically free though the former fears crunch to an extent and groudon fears fire blast to an extent.