Well, it really just depends on which one your playing, tell me and ill answer
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it has 72 floors
I think there are an Unlimited number, because if you manage to get a green shard from a wild pokemon, you can trade it with the shard hunter for a leaf stone. (He has an unlimited number of them, as long as you have a green shard to give him.)
yellow shard and red shard and green shard
14 floors
there are 8 floors