you can get mushrooms if you go to mt moon and use the item finder in the lower levels near rocks
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No, but they do carry them. If you want lots, catch as many of them as possbile, then release them.
Yes you can trade leafgreen version Pokemon to another leafgreen version.
On Pokemon Pearl's title screen, if the Pokemon LeafGreen game is in the GBA slot, click on "Transfer From LeafGreen" and you can choose six Pokemon from LeafGreen to transfer to Pearl, but be careful-you can't trade them back.
Manaphy is a legendary water type of Pokemon. It is not possible to get this Pokemon in the game Pokemon LeafGreen.
Piplup does not exist in Pokemon LeafGreen or FireRed.