Munchlax is actually pretty strong for a wall. Base 85 Atk is good by NU standards where offensive threats like Sneasel or Kangaskhan have base 95. You can actually afford to run some investment which is what I decided to do. It makes you slightly weaker against wallbreakers like Mega Camerupt but you dish out pretty solid damage. For example,@Can Eh
I'm pretty sure Monty's skepticism of Munchlax comes from its offensive passivity. Sure it can take all these special hits, but what can it do back with 0 attack investment? What makes it any better than Sliggoo, which has superior typing and more speed? (only thing I can think of is the curse set, which is walled by any Ghost, Rock,and Steel in the tier)
0 SpA Sliggoo Ice Beam vs. 4 HP / 0 SpD Sawk: 71-84 (24.3 - 28.7%) -- 99% chance to 4HKO
104+ Atk Munchlax Return vs. 4 HP / 0 Def Sawk: 151-178 (51.7 - 60.9%) -- guaranteed 2HKO
252+ SpA Sheer Force Mega Camerupt Earth Power vs. 152 HP / 252 SpD Eviolite Munchlax: 135-159 (30 - 35.4%) -- 21% chance to 3HKO
252+ SpA Sheer Force Mega Camerupt Earth Power vs. 252 HP / 252+ SpD Eviolite Sliggoo: 102-120 (30 - 35.2%) -- 19.6% chance to 3HKO
Sliggoo is actually garbage offensively because you need Dragon Tail to be viable, and that means no Dragon Pulse because it's redundant. T-Bolt/Ice Beam are flatout weak and you need to run max SpDef unlike Munchlax, who has pretty much the same bulk with a lot less EV's. Sliggoo is also Sneasel bait, gets 3HKO'd by Samurott's Ice Beam and can't even hope to damage Mega Camerupt even slightly unless you run Muddy Water. Also Whirlwind > Dragon Tail when it comes to Substitute. Taunt is pretty rare in NU.
As for the Curse set yes it's walled by Ghosts, although it will beat stuff like Ferroseed or Regirock eventually and even defensive Rhydon if Munchlax is the last mon. Still loses against Klinklang and Mawile though unless they're weakened beforehand. CurseLax is a pretty scary late game sweeper as there aren't that many mons that can check it. Fighting-types are very popular but there's only a few good ones in the tier. Same with Ghost-types. And Steel-types. See where I'm going? If my opponent has 3 special attackers that means 3 mons that I can freely setup on, and that's how it goes a lot of the time. It's like mons like Scarf Mesprit or SD Scyther; when their counters are gone there's not much you can do to stop them from sweeping. CurseLax is kind of the same except it just tanks everything and sweeps that way.