This might be good as long as no says something silly and not true.....
no prep , in character , ki blasts are ok as long no one say "he one shots", Roshi can only use moves that are in the manga/ anime not any game also no cheap moves, Roshi can use max power or 50% power which ever one is fair, they both start at base power
Location - On top of Trick Tower
Note - How fast are these two? If one is faster then the other then speed is equal