Goku has the ability to destroy world's and galaxies yet controls this power with ease. In the hopefully reboot of dbz where he becomes a god, he will time travel and fight other beings from other dimensions of his universe. As bills said, he was the 7th strongest god of destruction I think? Goku, obviously intrigued by this will obviously end up becoming the strongest in any alternate universe. Thus, becoming the ultimate warrior god to exist in any plane or dimension