Whimsicott also works as a decent anti-lead I find, as it's able to Taunt common leads such as Azelf and Aerodactyl and is one of the relatively few things that can out-Taunt Sableye, thanks to being a faster Prankster. I've used this set before, and it works great as a pivot in the early-mid game. In addition, when his usefulness has expired, he can use Memento to give a teammate a fantastic set-up opportunity, so pairing him with Pokemon who can take advantage of this such as Cloyster or Dragonite is recommended.
Whimsicott @ Leftovers
Bold - Prankster
252 HP, 252 Defence, 4 Sp. Def
Bear in mind that using Whimsicott as a pivot actually relies on facing up against more skilled opponents who might switch their Pokemon out of a predicted Stun Spore, allowing you to grab momentum with U-Turn. Against lesser skilled opponents who don't switch, pivotting with Whimsicott is not nearly as effective. He's definitely a harder Pokemon to use than something like Serperior, but he does have a niche in access to Prankster and the ability to pivot with U-Turn and create set-up opportunities with Memento.
Alternatively you could unleash your inner cancer Nazi and run a dEnIsSsS Baton Pass team, but doing so would require you to sacrifice your soul to Satan.
Who doesn't see the future anymore?