Originally Posted by Wing Gundam Zero
It's not helpful because you're doing it wrong, believe me. Try taking SSJ4 Goku and spam Kamehameha.
Problem is Goku's SS4 takes too long to unleash. With all the time wasted charging up enough Ki the fight could already be over. Generally resulting in your loss.
Omega Shenron is imo a lot more useful. He has 7 fully regenerative bars of ki and his Forward B technique (can't remember name) is over powered and has a great effective range and is great for ring outs if it comes to that. Got all 4 tournaments on 1 try purely using Omega Shenron.