Best Training Pokemon against Snorlax?

I usually use a Omanstar with WG/HP the rock typing gives you some resistence.

Wigglytuff is still really good for prestiging, especially against a lick snorlax. Having a lower CP might cause you to gain more prestige when training. I would think many pokemon with a rock typing would also be good (omastar, rhydon, golem).

I sometimes use Hitmonchan/Hitmonlee - nice low cp to get the 1000 prestige but you'll need more than one...

Mine has always been Pidgeot. Resists lick and earthquake great moves, balanced stats

Primape with low kick and cross chop as well. Nothing really works great and its time consuming and requires lots of pots or lots of dodging.

Pretty much everything with wg\hp works nicely. Golduck, Starmie, Seadra with CP about 1200-1300 make a good job. If you carefull, one is enough, but in case of some mistakes, have second as backup.

100% Pidgeot with Wing Atk and Hurricane. Attacks quick enough that dodges are easy and does some good damage. Like another person said it also resists Lick.

Love my Pidgeot vs Snorlax!

I have used the above-suggested Primeape w/ fighting moves. I also have a decent Rhydon with quick move Rock Smash (fighting) but is weak to Earthquake. So dodging still required.