I think having them together is fine as they are completely different Pokémon.
(I do think a potential paradox clause should be created though to stop teams from being stacked with them)
Nah paradoxes are just like anything else, each too different from one another.
Reminds me of ultra beast, but a bit more needy due to weather/electric terrain. I'm sure there's cores out there but nothing crazy unless the mon itself is broken.
None of them particular stat out as broken to me, but granted I've been fixated at only looking at the volc forms and iron moth is basically latios with a different typing and no setup move, while other one feels like it needs some experimenting being a physical attacker and not fire type for flare blitz sun spam either.
Tera doesn't stop if you switch out does it? what about if you revive? If it persist I could see slither wing fire tera so it can flare blitz spam.. this thing fucking hurts:
+1 252+ Atk Life Orb Fire Type Slither Wing Flare Blitz vs. 252 HP / 252+ Def Toxapex in Sun: 173-204 (56.9 - 67.1%) -- guaranteed 2HKO
Holy shit