In my platinum(which a kid stole from me), I had an AMAZING Torterra and I would love to get another one in hg. Is it possible?
I believe you need to trade for it and can't simply get it. Sorry about your game.
No you can't. You can get one from each of the other starter sets (Kanto, Johto, Hoenn) but you can't get a Sinnoh starter, sorry.
If someone stole your game you should get it back!