Whimsicott and Farigiraf are possible, but Whimsicott with Farigiraf support is not. Whimsicott is possible. As the other answers say, you simply get another prankster taunter that's faster. However, there is no faster prankster taunter, but Whimsicott can speed tie it. You either need to hope you win the speed tie, or you have to scarf your Whimsicott, which is obviously not a great item to have on a support mon. A better idea is to just tailwind yourself. Farigiraf is even easier. You simply have to taunt it, as trick room as -6 priority. Roar also works, but taunt is better. If it has taunt support, get a Farigiraf yourself if the support is prankster, and use either Aerodactyl, the fastest non-mega, or Mega Alakazam, the fastest mon. Both can learn taunt. Farigiraf and Whimsicott together though is not possible, as you cannot turn off Farigirafs ability in time for Whimsicott to set tailwind.