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you can rarely find them on 1 island but its easier to evolve a ponyta
No, you cannot find cyndaquil in LeafGreen.
LeafGreen version does not have Growlithe.
There aren't growlithe in LeafGreen. FireRed has growlithe, LeafGreen has vulpix.
The only way to get it is by the safari zone which makes it harder to catch it there really is no easy way to get it so when you find it i suggest trying to capture it as soon as you find it.
That item doesn't exist in leafgreen.
There is only one known way to find Vulpix in Pokemon Pearl. To make Vulpix appear you need a copy of Pokemon LeafGreen in the GBA slot of the DS. While Pokemon LeafGreen is in the GBA slot Vulpix should start to appear on Route 209.
you cant go underwater in leafgreen!!
Piplup does not exist in Pokemon LeafGreen or FireRed.
Look around! It's easier once you beat the Eilite four and get all the Hms If you can give your PKMN items that attract Pokemon and run in the tall grass for a while that should make it easier.
Psyduck is in firered not leafgreen you can find it using a good or super rod in the safari zone.
kingdra level 41 and two dragonairs level 37