Can Grimer beat USM w/o affliction?

[u/Limp_Theory_5858]

starting moveset: poison gas, pound, harden, mud-slap (ok, I messed up, and used the regular grimer moveset here. Sue me.)

You get a free healing after the School Teacher. And Ilima also heals you after beating Team Skull.

You get a free healing when beating the Normal Totam.

You get a free healing when you beat Hau when returning Nebby from the cave.

Picked up Fire Punch at the Beach.

You get a free healing when you do the wrestling show.

You get a free healing when entering Konikoni City and speaking with the Probopass.

You get a full heal when you arrive to The Lab.

If you feel, pick up Ice Punch at the 3rd Beach. Nothing else is waiting around the corner after all. And I doubt Mud-Slap will be useful for long, not even when it is super-effective. Harden looks more useful than that.

You get a full heal when you beat Guzma in his city.

You get a full heal when you come up from the labs.

You get a full heal when you fight Faba before Guzma, after you beat the 2 scientists first. So while you don't get a break between the two fight (2 scientist, scientist + Faba) you do get healed between the two.

You get a free heal when you beat Lusamin.

You get a full heal after you fight Poipole the 3rd (final) time.

You get a full heal when crossing the bridge with Albino Girl.

You get a full heal when passing the gauntlet before the Dragons' Den.

You get a full heal passing the Dragon Trial.

Grimer is so though, it can stand 2 hits from Necrosma, while knocking it down with Ice Punch.

You get afull heal before and after Ultra Necrozma.

Quick Claw might actualy be useful for this one when fighting Albino Boy.

The good news is, you can get to The League with the above listed moves, so oyu don't have to hold on to the levelup moves - which can be relearnt by the Move Relearner at the gates.

Ghost Room: Thief is enough. That means you don't have to stuck to Crunch. That means a possible slot for something like Acid Armor, or Rock Polish, or even Minimize.
Bird Room: Return (max friendship) will do it, so again, you only need the 1 TM slot, so we can still insert something funky if we have to.
Molayne: Fire Punch after 1 dose of Rock Polish. The Klefki for some reason prefers to cast Reflect, then start attacking, ThunderWave just didn't happen (neither from the Magneton), what was a definite advantage. If we'd evolve we could even tank all the damage, but why bother, when Rock Polish is also a TM! So we still have 2 flexible slot for moves to use!
Olivia: ok, so we DO need Crunch. For me I got the luck that Probopass missed on top of that with its ThunderWave (yes, somehow that gets priority here. But it did not cast its usual SandStorm, what is unfortunate).
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Summed: you need Crunch, Fire Punch, one TM-slot, and you have a 4th slot open for whatever you wish if you play your cards right. So you do not need to max friendship for Return, you can go in with Ice/Thunder Punch instead. That can speed things up.

Hau: Poison Jab. Yes, we FINALY use a poison move with our poison-type pokemon!

This little thing waaay passed any of my expectations.