The way to get through wish cave is only on pure survival. Make sure whern you go in there you know what you're getting your self into> myself iv'e made it through. Make sure you bring Pokemon that level up easy or you will have a problem
you get through wish cave
When you save medicham from wish cave medicham gives you a wish stone. If you lose that you can get it from the 50th floor in wish cave.
Beat Jirachi
At the and of wish cave which has 99 floors. You can get to wish cave after you accept a mission there.
When you get Wish Cave, and you get all the way through it with the Wish Stone, you will see Jirachi at the end. She will ask you if you want a wish. If you refuse the wish, she will ask to join your rescue team.
jaraichi is the Pokemon on floor 99 of wish cave
u have to get dialga and the message
There are several deungeons you can get it. You can get him in wish cave and western cave.
Celebii is not in Wish cave, but Jirachi is. Jirachi is located at the 99th floor.
I think its random
If you have already rescued the Medicham from Team Meanies in Wish Cave, you can still find another Wish Stone on floor 50 of Wish Cave.
get to the top of wish cave and beat him