For this you must have a character that knows an ultimate attack (like "Big Bang" or "Spirit Bomb"). Also, this is much easier to do if you can get their baselineki guage the same or higher than the cost of the attack. For example: if you want Goku to use the "Sirit Bomb"(which is actually "Sper Dragon Fist"), which costs 5 ki guages to use, get Goku to SS3 or SS4. Then, just stay alive until your opponent goes into hyper mode and keep flying backwards so you don't get hit (which you should almost always do when your opponent is in hyper mode) until they are right about to exit hyper mode. That is when you enter hyper mode and because they cannot move for about 4 seconds, you have just enough time to use your ultimate attack. NOTE: in case you don't know what the basline ki guage is, it is the point where you will automatically recover ki, also the bars will be bigger than usual and will recover faster when you charge your ki by yourself.