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believe it or not I had absolutely no problem with:
Snorlax Careful
Ability: Gluttony
Item: Figy Berry
EV: HP and Defense, and little in Atk, like, 12 points
Belly Drum
BrickBreak
Return
Rock Slide/Earthquake (I kept altering to see which one I prefer)
Oranguru Relaxed
Ability: Telepathy
Item: Mental Herb/Leftovers
EVs: Full HP and Defense
Instruct
Psychic
Taunt
Trick Room
All you do is Belly Drum and Trick Room in the first turn, then any of Snorlax's moves + Instruct, and pretty much anything will fall. Taunt and Psychic are just in case you need them..
Ash-Greninja and Mega Blaziken in the party just in case something goes wrong, but I almost didn't use them at all, just when the opponent KOed one of the leads, which was pretty rare..
Oh and make sure Oranguru is faster than Snorlax, or else in Trick Room it'll instruct him to use Belly Drum again, and that Snorlax's HP is an even number, so he'll activate Gluttony and fully heal his HP (like, mine is 266, half of it will leave Snorlax on yellow HP, which activate Gluttony)