Dratini-Buy From Celadon City Gambling Place,Safari Zone Kingdra-Catch Horsea Level-up,Catch Seadra(Level-up from Horsea) and Trade
dragonite is the strongest dragon there is in leafgreen
In meteor falls.
safari zone (fishing wit supe rod)
Catch lots of dratinis or get one from Pokemon colosseum or Pokemon xd gale of darkness.
Dragonair does not learn Dragon Rush in Pokemon Leafgreen. However, it can learn the move in Pokemon Diamond, Pearl and Platinum at level 39.
On six island go south and use surf you should find an item that's the dragon scale.
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digla
Piplup does not exist in Pokemon LeafGreen or FireRed.
No, you cannot find cyndaquil in LeafGreen.
you should go to gamestop
LeafGreen version does not have Growlithe.