This is what I've been using and its been surprisingly useful in its walling prowess:
Snorlax @ Leftovers
Ability: thick fat
EVs: 52 HP / 252 Def / 200 SpDef
- Sleep Talk
- Body Slam
- Crunch / whirlwind
The main role of this build is for Snorlax to sit there and just be...fat. Max defense to patch up its sub-par defense to tank a surprise physical hit better, 200 EVs in special defense to take advantage of its high base stat and then the rest in HP. The reasoning for only 52 in HP is that its already stupidly high and Snorlax would benefit more from boosting its defenses than trying to do a Blissey and sponging. Moveset are as follows: Rest-talking for semi-reliable recovery. Due the the change in sleep mechanics, this is now a vaiable option as long as you remember how long Snorlax has been asleep for. Means Snorlax can hang around longer and doesn't care about status. His attacking moves are Body Slam, for STAB and para chance, and Crunch. Since steels don't resist dark moves any more, this is the perfect go to option and also hits those ghosties who are immune to body slam including levitating ones.
Snorlax does invite set-up pokes so a worthwhile investment would be whirlwind if you're terrified of them, although this is what team mates are for and I often partner up my Snorlax with Skarmory to phaze out pokes.
Beautifly are my Bishie!
hands off or my Beautifly's shall take you away and have their way with you!