Here's an easy way for you:
- Breed a Male Espurr that knows Fake Out with a Female Sneasel/Weavile.
- Once bred, hatch the egg, and the new Sneasel should know Fake Out.
Espurr learns Fake Out at Level 19.
[Source][1]
You can also substitute Espurr with the following Pokemon if they are male and know Fake Out:
Meowth, Persian, Nuzleaf, Shiftry, Skitty, Delcatty, Glameow, Purugly, Purrloin, Liepard, Mienfoo, Mienshao, Meowstic (M or F), Pikachu, Raichu, Seel, Dewgong, Aipom, Delibird, Spinda, Kecleon, Chimchar, Monferno, Infernape, Ambipom, Buneary, Lopunny, Scraggy, Scrafty, Smeargle
[1]: http://www.serebii.net/pokedex-xy/egg/461.shtml#fakeout