I'm going to have to agree that Amoongus is definitely capable of holding its own in RU despite being a NU pokemon. The set that I am testing out right now is
(Amoonguss) (F) @ Life Orb
Trait: Regenerator
EVs: 240 HP / 252 SAtk / 16 Spd
Modest Nature
- Sludge Bomb
- Spore
- Giga Drain
- Hidden Power [Ground]
HP Ground is really effective against steel types that want to wall you like Aggron (without Magnet Rise), Magneton or Steelix. 240 HP minimizes LO recoil, but I'm not sure if its the most efficient with Regenerator. 16 Speed EVs is to speed creep on opposing Amoongus and other pokemon that have base 30 speed.
Amoongus is capable of winning a lot of 1v1 matchups against a lot of pokemon in this metagame. And with Regenerator and Giga Drain, you can't just wear it down with weak attacks, like you can against other defensive pokemon like Sandslash or Qwilfish.
Being able to take something out of the game with spore is great in itself but it can really take advantage of its typing in this meta. It's a great check to fighting types and has pretty good matchups against some of the more common pokemon in the tier. Here's how Amoongus matches up against the top 15 according to usage stats:
Nidoqueen - Fire blasts does a little too much damage. But you can always stay in if you're healthy and spore it. 252 SpAtk Nidoqueen (+SpAtk) Fire Blast vs 252 HP/0 SpDef Amoonguss: 72.22% - 85.19% (2 hits to KO).
Sceptile - Great answer to it. Not much it can do bar the SD Acro set or hope to get big crits with HP Ice/Fire.
Slowking - Takes psychics very well and respond back with Giga Drains.
Gallade - Psycho Cut is an easy 2hko, while a majority of them run
Uxie - it sets up on Amoongus like it does on a lot of other pokemon. You can still weaken it with Sludge Bombs and Giga Drains.
Entei - Absolutely nothing you can do, but Entei has that effect on a lot of pokemon in this metagame.
Galvantula - Galvantula can't do much to Amoongus, but Amoongus can't do much back. You can always put it to sleep if necessary.
Typhlosion - Similar to entei but is a lot less threatening than it.
Aerodactyl - Not much it can do to you, but Giga Drain may not be a 2hko unless you're life orbed.
Sandslash - EQ is not a 2hko and Giga Drain is an easy OHKO.
Hitmonlee - Blaze Kick is the only move that can really do anything to you. And that's not a guaranteed 2hko if you run defense EVs, and it has to hit consecutively. Blaze Kick is only used 32% of the time on hitmonlee as well.
Cresselia - Psychic is a 2hko and there's not much you can do to it. Sludge Bomb does around 30 + %, but they can just moonlight off the damage. Sporing Cresselia is an option, but
Tangrowth - It can't do much to you other than Sleep Powder, but Sludge Bomb is an OHKO on defensive variants.
Spiritomb - Similar to Galvantula. Will-O-Wisp can be a little annoying. Clear Smog can be pretty effective against Calm Mind variants, but that's not the set I'm trying to advocate.
Feralgatr - Feralgatrs rarely run ice punch and it won't be able to OHKO regardless. Giga Drain hits Feralgatr's weaker specially defensive side and there's always Regenerator to fall back on.