Reuniclus@Life Orb
Trait: Magic Guard
EV's: 252 HP/252 SpA/4 Def (0 Speed IV's)
Quiet Nature
-Calm Mind
-Trick Room
-Focus Blast
-Shadow Ball
This set has worked wonders for me. This is how it works: switch into something non-threatening and set up a Calm Mind as they switch out into something else. If it is something that can cause damage but not kill you, use Trick room and begin to sweep. If it's something devastatingly powerful, it would be best to switch out. Yes, that is a flaw with this set, but this set is more for late game sweeping when you already took care of the stuff that can harm Reuniclus. after the 2-turn set up, begin to fire off +1 SB's and +1 Focus Misses like no tomorrow. The reason why I do not run Psychic is because replacing either one of his moves would result in being walled by either Psychic types or Dark types. Here are some damage calcs:
+1 Focus Miss vs 248/0 Scizor: 324-382 (94.46 - 111.37%) 62.5% chance to OHKO
+1 Shadow Ball vs 0/0 Salamence: 243-287 (73.41 - 86.7%) 87.5% chance to OHKO after Stealth Rock
+1 Focus Miss vs 252/0 Chansey: 348-410 (49.43 - 58.23%) 2HKO after Stealth Rock
+1 Focus Miss vs 252/0 Blissey: 418-494 (58.54 - 69.18%) 2HKO after Stealth Rock
+1 Focus Miss vs 4/0 Terrakion in Sand: 396-468 (122.22 - 144.44%) OHKO
+1 Shadow Ball vs 252/0 Gliscor: 230-271 (64.97 - 76.55%) guaranteed 2HKO
+1 Focus Miss vs 252/232+ Skarmory: 250-295 (74.85 - 88.32%) 6.25% chance to OHKO after Stealth Rock
+1 Focus Miss vs 252/252+ Tyranitar: (128.71 - 152.47%) guaranteed OHKO
+1 Focus Miss vs 252/0 Politoed: (70.57 - 83.07%) 2HKO after Stealth Rock
+1 Focus Miss vs 252/120+ Ninetales: (63.14 - 74.28%) -- 2HKO (nearly a chance to OHKO after SR)
+1 Focus Blast vs 252/84+ Abomasnow: (134.37 - 158.33%) guaranteed OHKO