Anyone tried Mew? Genesis Supernova is pretty powerful, you can use a Nasty Plot set with Psychic and two coverage moves.

It's actually pretty strong:

252+ SpA Choice Specs Tapu Lele Psychic vs. 0 HP / 0 SpD Garchomp in Psychic Terrain: 415-490 (116.2 - 137.2%) -- guaranteed OHKO

+2 252 SpA Mew Psychic vs. 0 HP / 0 SpD Garchomp in Psychic Terrain: 421-496 (117.9 - 138.9%) -- guaranteed OHKO

Remember that Mew learns every TM and Tutor, so it gets Aura Sphere, Flamethrower, and Earth Power for coverage plus a bunch more.