Board Thread:Tips, Tricks, and Questions/@comment-211.25.162.180-20130903022032/@comment-154.20.67.86-20140104120043

You CAN receive supers, and ultras via random battles. That having been said, you would find the same problem as the original poster, the drop rate is very low.

To answer the first question, You see a very low droprate because it promotes being in a troop where getting supers is alot easier. Being in a troop gives you a reason to come back to this game, and eventually for ultras and epics you would eventually buy gold for spins. The whole system is built around buying a chance to get good monsters, it is how they earn money.