you find chinchou under the sea when you dive
Chinchou cannot be obtained in LeafGreen you will need to trade it from Emerald.
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you can find chinchou in variuos places inside Mt.Coronet
You don't.
you can find it on route 220 using the super rod
Piplup does not exist in Pokemon LeafGreen or FireRed.
In Sapphire, there is Electrike, Manectric, Pikachu, Pichu(breeding), Raichu(evolve), Voltorb, Electrode, Plusle, Minun, Magnemite, Magneton, Chinchou, Lanturn, Zapdos(trade from FireRed or LeafGreen), and Jolteon(trade from FireRed and LeafGreen).