Taillow isn't in Leaf Green, just emerald Sapphire and ruby
Piplup does not exist in Pokemon LeafGreen or FireRed.
You cannot catch houndour in Pokemon leafgreen either get one from Pokemon emerald or Pokemon colosseum.
That item doesn't exist in leafgreen.
Nowhere.
on a island
No, you cannot find cyndaquil in LeafGreen.
Piplup does not exist in Pokemon LeafGreen or FireRed.
you should go to gamestop
Taillow evolves at level 22.
LeafGreen version does not have Growlithe.
You can't catch a Taillow in Pokemon Platinum, but you could catch the later evolution (Swellow) using Poke Radar on Route 213, and then breed it to get a Taillow.
In the grass...
When you are at cherrigove city go west, and do surf, go north while surfing, you will find two trees, use headbutt and finally find taillow. Nadine, Egypt
You cannot catch houndour in Pokemon leafgreen either get one from Pokemon emerald or Pokemon colosseum.
there is no such Pokemon
That item doesn't exist in leafgreen.
you can't catch aipom in leafgreen but you can get one from Pokemon colosseum or Pokemon emerald.