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This team has no way to break is the main issue. This team is never breaking past a stall or even bulky balance team with just a Specs Pult. Probably you can afford to replace either Amoonguss or Toxapex here, they do a lot of the same things.

Do you have any recommendations?

https://www.smogon.com/forums/threads/sv-ou-great-cores.3723774/post-9865781
Btw heres the link to the full descriptions of why those first 3 mons (Zap, Pex, Amoo) are used if you want to know.

Would replacing Pex/Amoo for Glowking work?

https://pokepast.es/b6c26a559fe175f0
Like this

This team has nothing for stall, any fat team will wall this out forever. Try to fit in a breaker, ideally by replacing one of your bulky poison types. I understand why the core might be nice but there's too much defensive overlap to justify using such a core on a balance team.

https://pokepast.es/20ac5a47c5334305
Would this work? Or is Ace not sufficient, might not be.

No unfortunately, you're still never breaking stall here. Cinderace won't do much of anything against Alomomola and Dondozo.