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You can't! Cyndaquil are not found in the region and Pokemon FireRed/LeafGreen are unable to trade with Gold Silver Crystal HeartGold or SoulSilver.
NEW ADDED-(takreader)
Actually, it is possible. If you have a link up cable for Gameboy or Gameboy Advanced SP AND a Old Old Old Gold or Silver version you are in very good luck. Because if you need a totodile or any of the starter Pokemon in that game for FireRed/LeafGreen you can use the link up cable to trade a Pokemon over to your Gold/Silver and get the starter Pokemon you need! you catch rattata and give it a rare candy and it transforms into cyndaquil
What else can I help you with?
How do you get Cyndaquil in Pokemon Pearl?
you have to trade cyndaquil to pearl to get it
Where do you find cyndaquil on Pokemon SoulSilver?
You cant find one but you can choose Cyndaquil as your starter Pokemon.
Can you trade Pokemon LeafGreen with Pokemon LeafGreen?
Yes you can trade leafgreen version Pokemon to another leafgreen version.
How do you get cyndaquil in Pokemon HeartGold?
It's a starter Pokemon.
Where do you get cyndaquil in Pokemon Emerald?
you cant catch it you have to catch all 200 of the hoen Pokemon and professor birch will give you cyndaquil, chicarita, and todadile
