Evolution of the Nuclear Type

[Kuribat]

But maybe they wouldnt contaminate everything after their DNA stabilised? Like how fire types with open flames on their bodies dont set everything around them on fire?

It isn't the same thing as Nuclear type is a result of an unnatural mutation, and probably dangerous for the health of contamined Pokémons, but I see your point.

Bug needs a buff imo so I doubled down on them by adding strength to their resistance. Normal type as a reference to their earlier weakness to everything, also I'm bias and love Normal types. I didnt mention Steel because Steel resists too much and a potent enough acid can melt it and steel isnt quite immune to the effects of an atomic bomb. It's a stretch but I was trying to find some balance.

I see what you mean but you cannot simply put weaknesses and resistances because of balancing reasons, there need to be a logical link. I can see the Bug one now that I think of it because of cockroaches, but Normal Type ? I don't think it would work. As for Steel, we are talking about radiations here, not acid. And radiation has way less effect on minerals than it does on biological materials. Besides it wouldn't be logical that if the type become less potent, it becomes more powerful against a type it didn't affect before.

Anyhow your idea isn't bad at all, in fact I like it. But clearly it would need to be thought very deeply to make sure there is not too much inconsistencies.