You have to go to the Orange Islands. (Which is impossible)
Ash, or Red in this case, is at the top of Mt. Silver staring out into the distance. He is dressed like a firered/leafgreen character.
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.
That item doesn't exist in leafgreen.
Ash is not in platinum..
you cant go underwater in leafgreen!!
Piplup does not exist in Pokemon LeafGreen or FireRed.
Psyduck is in firered not leafgreen you can find it using a good or super rod in the safari zone.
Blue is Gary (your rival in firered/leafgreen, Ash's rival in the tv show)
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you cant