You migrate it from your GBA game.
I have them in Heartgold
toddile,chikorita and cyndaquil
yes. you can trade Pokemon from diamond, pearl, or platinum to heartgold or soulsilver.
you can trade Pokemon from heartgold and soulsilver to your diamond,pearl, or platinum.
You can't. You need to get Heatran from Pokemon Diamond, Pearl and Platinum and then trade to heartgold and soulsilver.
Pokemon No. 152 is Chikorita, and is the starter Pokemon in HeartGold and SoulSilver, but can also be imported from Pokemon Emerald.
A Pokemon from a Diamond, Pearl, Platinum, Heartgold, or Soulsilver event.
You need to trade it from HeartGold/SoulSilver.
You can't talk to your Pokemon in Pokemon Platinum. Only in Pokemon Heartgold and Soulsilver.
Chikorita right? Well it's simple. You trade from Soulsilver or HeartGold.
You Can Get Totodile By Trading It From Pokemon Emerald Or Pokemon HeartGold Or Pokemon SoulSilver.
In the Platinum it is 44, but I am not sure about Heartgold and Soulsilver.