RMT OU singles on Pokemon Showdown

Question

Sans (Haxorus) @ Focus Sash
Ability: Mold Breaker
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Dragon Dance
- Dragon Claw
- Poison Jab
- Earthquake
Papyrus (Sceptile) @ Sitrus Berry
Ability: Unburden
EVs: 4 HP / 252 SpA / 252 Spe
Modest Nature
- Energy Ball
- Dragon Pulse
- Focus Blast
- Hidden Power [Fire]
Undyne (Avalugg) @ Leftovers
Ability: Ice Body
EVs: 4 HP / 252 Atk / 252 Def
Lax Nature
- Hail
- Rapid Spin
- Avalanche
- Rock Slide
Alphys (Blissey) @ Leftovers
Ability: Natural Cure
EVs: 252 HP / 4 Atk / 252 SpD
Sassy Nature
- Soft-Boiled
- Psychic
- Ice Beam
- Toxic
Toriel (Whimsicott) @ Leftovers
Ability: Prankster
EVs: 252 HP / 252 SpD
Calm Nature
IVs: 30 SpA / 30 SpD
- Substitute
- Leech Seed
- Dazzling Gleam
- Toxic
Asgore (Sableye-Mega) @ Sablenite
Ability: Magic Bounce
EVs: 252 HP / 6 Atk / 200 Def / 50 SpD
Careful Nature
- Calm Mind
- Recover
- Will-O-Wisp
- Foul Play

Comments

Bar sableye none of the other Pokémon are OU..

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That's a problem. To be honest, every single pokemon you have apart from sableye  and Haxorus is kind of outclassed by other pokemon in the meta.

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Haxorus is also kind of outclassed unless it's just for lategame wallbreaking.

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What's up with the special attacker Blissey? It's more meant for healing/toxic stalling. It's attacking stats are not the best. And in OU you would be better off with Eviolite Chansey with Wish, Seismic Toss, Toxic/Protect/Heal Bell. You could also try Counter on Chansey. I've tried it and it really helps in knocking out physical attackers if they don't get a one-shot with Superpower.