What is a wish stone in Pokemon Mystery Dungeon explorers of time?

Answer 1

Unfortunately, you cannot obtain the Wish Stone again after you have lost it. The item is obtained as a reward for a special mission, and once you have lost it, you may not get it back, as the special mission has been completed.

This supports the theory that there is only one Wish Stone available per Rescue Team game.

all hope is not lost i heard that you can find another at wish cave floor 50

Answer 2

Wish Stone: Let's Jirachi grant you a wish.

No you don't need it to recruit Jirachi

If you lose it, it'll appear in the Wish Cave's 50th Floor.

Jirachi is in here:

Wish Cave

Floor 99!

Answer 3

look around open feilds or around water resources

Answer 4

save medicham from wish cave.

the reward is the wish stone.