In the Pal Park I think
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you have to trade cyndaquil to pearl to get it
you cant catch it you have to catch all 200 of the hoen Pokemon and professor birch will give you cyndaquil, chicarita, and todadile
You can't catch it. It's a starter pokemon.
You can't catch it in Pokemon Diamond or Pearl. You have to transfer it via Pal Park from Pokemon Emerald, Leaf Green, or Fire Red. Before you do this, however, you need to have a national Pokedex in both games, and have a Cyndaquil in the GBA game. This is somebody else. I know theres an action replay code to get cyndaquil in diamond becuz i have chikorita ad totodile.
neither of them is better, they are both the same, but in diamond, you catch dialga, and in pearl, you catch palkia, and you can catch different Pokemon in each game for example: you can catch this Pokemon in diamond, but not pearl but: you can catch this different Pokemon in pearl, but not diamond