Sports Champions

The trophy description is a bit misleading, because you don't actually need to win for the ring out to count towards the trophy. This means that if you play a 3 round match, you can get 3 ring outs that count.

Anyways, the fastest way to do this is to just play the first match in the Bronze Cup over and over again until you have the trophy using the following method:

Select Rin and hold up your shield with the button. This will make your opponent attack. When you see your opponent is about to swing, dodge left with the button on your left controller and swing at the same time. This will most likely send your opponent flying. Now perform a jump move while he/she is lying down. When they get up, shield bash until he/she is falling off the edge. Now perform a soft shield bash to get a ring out.