I happened to think about this after the Omega Shenron v SS4 Gogeta battle popped into my suggestions and I was like "Eh, why not watch it". If anyone of you don't remember during the fight Gogeta uses a move called Big Bang Kamehameha, which combined Vegeta's most powerful attack with Goku's. That got me to thinking What would be the most powerful energy attack, personally I think it would be some sort of high-level end all be all Big Bang Kamehameha used by Gogeta in some sort of final form. I would like to know what you all think and even leave suggestions as I am slowly getting back into Dragon Ball franchise as a whole again.