It is impossible without trading from Diamond, Pearl, or Platinum, or without the use of a glitch or cheating device.
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Pokemon HeartGold Will Have Sinnoh,Kanto,But Hoenn Least Likely.
No but you can go to kanto but you can own sinnoh pokemon.you cant
No but when you beat the main story if you have the sinnoh games you can do the POKETRANSFER on route 15 and send them over from that game.
CHATOT is in the Burned Tower when you play the Sinnoh music on thursdays
You have to beat the Pokemon league in Hoenn, Kanto and Johto. In Sinnoh, there might be some trainers who have Torterra.