If Godzilla had the venom symbiote

That might in fact, make Godzilla weaker. Venom has a weakness for fire, and can be exploited. 

Ok but more importantly would he be dancing to James Brown?

He would be a nightmare, and weak just like Darth Ghidora said.

I'd think you'd like this video I saw a while back. It's pretty much everything you said, but with even more monsters like Ghidorah, Anguirus and Kong.

https://www.youtube.com/watch?v=dJ57GAXT6yU