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This video should explain it:
Short version: When you successfully perform & finish a combo, you get a Dragon Ball. When you get all 7 AND max out all 7 gauges of your Super Meter, the next combo you perform & finish will summon Shenron.
It's actually more impractical than it sounds, especially when it comes to Top Players. So it's not too worrisome.
It's also not a "I win!" Button.