in the begging of the game theres a gym near pallet town that's where Giovanni is the last gym leader
in sunnyshore
celadon city grass Pokemon
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you go search in safron
Go into the Pokemon mansion and look around. At the end you will find the key to the door.
Piplup does not exist in Pokemon LeafGreen or FireRed.
No, you cannot find cyndaquil in LeafGreen.
you should go to gamestop
The eighth gym leader is Claire in Blackthorn City
LeafGreen version does not have Growlithe.
In the grass...
You cannot catch houndour in Pokemon leafgreen either get one from Pokemon emerald or Pokemon colosseum.