If you use Omega Shenron at the Advanced World Tournament, set his skill tray to Sparkling 7. Now all you have to do is: at the beginning of the fight....slide backwards until you reach the end of the ring. Once your opponent makes a move, teleport behind him and knock him out of the ring. I'll be the first one to admit that this is a cheap way to win, but you need a whole lot of Zenie to buy all of the capsules that are in the shop. Doing this at the advanced tournament, provided you win it, will award you with 250,000 Zenie.
I say to use Omega Shenron, because his Ki gauge starts off as "Max".
Death is but a door, Time is just a window,...I'll be Back!!!!!