That item doesn't exist 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.
you find chinchou under the sea when you diveChinchou cannot be obtained in LeafGreen you will need to trade it from Emerald.
you find delibird in island number 4 in the snow caveDelibird is uncatchable in leafgreen get one from firered.
Take a good or super rod and fish in Viridian, eventually you may find a Poliwag*. Throw great or ultra balls at it until you have it. *That's the correct spelling.
POLYWHIRL!
Polywag evolved into Poliwhirl at level 25, an then into Poliwrath with a Water Stone.
Heads north from the resort area until you find a small pond and surf on it.
it evolves at level 25
No, you cannot find cyndaquil in LeafGreen.
Level 25
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.
poliwag evolves at level 25
you cant go underwater in leafgreen!!