I'm sure a lot of you have seen me use this team (or losing with previous variants, as there were many) on the ladder and I think this is about as good as it'll get for Snorlax in UU. At first I tried to build around the CurseLax set mentioned earlier aaaand.....yeah its not great. The current metagame just isn't kind to that Lax at all, with the likes of Breloom, Gliscor, Hippowdon, and Cobalion all running around to ruin its day. Most of the time it just ended up getting a few hits off on specially based Pokemon before dying and rarely got set up effectively even with team support (then again I'm not a great builder so I'm sure someone more creative could make it work). So instead I played to Snorlax's strengths as a team supporter itself by making it Assault Vest and taking advantage of the abundance of status in the tier and it's good offensive movepool.
AV Snorlax does an excellent job at trapping or otherwise handling the most common checks to SD Scizor and/or SD Breloom, the duo the team was built around. These include but are not limited to threats like Latias, Celebi, Starmie, Gengar, Chandelure, Tentacruel, and Empoleon. And because I'm running an unexpected amount of coverage in both EQ and Fire Punch, this Snorlax has the immediate power to punish its prior checks upon switch in (Breloom, Doublade, Cobalion, Scizor, etc.), taking some heat off of the team's main physical tank Swampert. In return, the two SD mons beat down the physical walls that shut Snorlax down such as Slowbro, Hippo, and opposing Swampert.
The Swampert set is the Icium Z lure set from the creative sets thread with a bit more attack to OHKO Serperior with rocks up. It also utilizes Counter to punish pesky U-turn Pokemon like Scizor and Darmanitan, and in general lets it be less passive against the tier's powerful physical attackers that could dent Snorlax.
The Snorlax spread itself lets it survive +1 Z Focus Blast from CM Cobalion and easily put it in Psychic or Mach Punch range with EQ. 44 EVs are put into Speed to outspeed Doublade, and the rest gets put into Defense since its HP is already great as is. Scizor runs enough speed for 4 Spe Suicune and the leftover EVs go to Special Defense to always survive +2 HP Fire from NP Celebi, a mon Snorlax actually kinda struggles with due to it's bulk and how much it recovers with Giga Drain. The rest is pretty self explanatory.
You usually open with Swampert or Altaria to threaten the most common Rocks setters, play the hazard game a bit there, then start playing one of your SD users early to punch holes into the team, utilizing AV Snorlax as necessary, then clean with Latias or the other SD user.
Feel free to put Defog on Altaria instead over Ice Beam to ease the hazard game, I just found that being able to bop Togekiss was too good since thats another Pokemon the entire team struggles with especially if its the Babiri variant. I also just never found myself using Trick or Healing Wish on Latias all that much.