I lost to a team using this a long time ago...Put up a video about it too but I'm not gonna promote it here:
Whimsicott @ Life Orb
Ability: Chlorophyll / Prankster
EVs: 4 HP / 252 SpA / 252 Spe
Timid / Modest Nature (Naive / Rash if running Knock Off)
- Giga Drain / Solar Beam
- Moonblast
- Psychic / Knock Off / Hidden Power Ground
- Growth
Offensive LO Whimsicott's really become a thing as of late, but only those with exceptional cojones will take it a step further by using it on a Sun team, hence the slashes of Solar Beam, Chlorophyll, and a Modest Nature, all the preferred options for it if you choose to use it on a Sun Team. Of course if you are not about that life you can use Prankster with Growth since it's still fast enough to function as a generally-decent cleaner. Psychic messes up Crobat and other Poison-type friends, while Knock Off can put down Chandelure and the currently-being-tested Victini, especially if you've netted a boost from Growth. HP Ground can pick off Fire-types an weakened Steel-types but it's really just there for coverage if nothing else. If you have Sun up, Growth gives a +2 to both Attack and Special Attack, which is where the potency really kicks in. Of course this set still struggles with Steel-types, but if you're using a Sun team (or any team in general really) that has no way to beat down most of the Steel-types in UU, then that's not so much the fault of this set as it is poor Teambuilding.
+2 0 Atk Life Orb Whimsicott Knock Off (97.5 BP) vs. 0 HP / 0 Def Victini: 263-309 (77.1 - 90.6%) -- guaranteed 2HKO
+1 0 Atk Life Orb Whimsicott Knock Off (97.5 BP) vs. 0 HP / 0 Def Victini: 198-234 (58 - 68.6%) -- guaranteed 2HKO
+1 0 Atk Life Orb Whimsicott Knock Off (97.5 BP) vs. 0 HP / 4 Def Chandelure: 213-252 (81.6 - 96.5%) -- guaranteed 2HKO
+2 0 Atk Life Orb Whimsicott Knock Off (97.5 BP) vs. 0 HP / 4 Def Chandelure: 283-335 (108.4 - 128.3%) -- guaranteed OHKO
252 SpA Life Orb Whimsicott Psychic vs. 248 HP / 4 SpD Crobat: 218-257 (58.4 - 68.9%) -- guaranteed 2HKO after Black Sludge recovery
+1 252 SpA Life Orb Whimsicott Psychic vs. 248 HP / 4 SpD Crobat: 322-382 (86.3 - 102.4%) -- 18.8% chance to OHKO
252 SpA Life Orb Whimsicott Psychic vs. 0 HP / 0 SpD Roserade: 174-205 (67.1 - 79.1%) -- guaranteed 2HKO
+1 252 SpA Life Orb Whimsicott Psychic vs. 0 HP / 0 SpD Roserade: 260-307 (100.3 - 118.5%) -- guaranteed OHKO
+2 252 SpA Life Orb Whimsicott Psychic vs. 252 HP / 240+ SpD Roserade: 252-299 (77.7 - 92.2%) -- guaranteed 2HKO after Black Sludge recovery