That's not what secret tickets are for. The tickets used in beak's cafe are from ep 4 max attack 3v2 tickets. Secret tickets as a physical item are from simulator 2.0, and they are used in the Good Luck! quest (ep 1 one player quest, all in japanese), for a bunch of lame prizes. I don't know how to get to the list anymore ever since psowiki died, but I don't remember anything notable on it.