Do you have a Pokemon you just have to use on your team otherwise you feel uncomfortable?

I can't play without my Liepard in doubles. Fake Out and Foul Play along with Prankster Encore and Taunt are just too good, since it can singlehandedly render useless anyone who Protects, Fake Out, stat boost, etc. I can't even try other Pokemon I want to test like Gengar because item clause means Liepard wants the sash.