i want to trade a tepig to heart gold but I dunno if it will work.
Comment: This (kind) of question has been asked already here, so your question is a little bit against the rules. You should look below the title type-bar. There are questions that are kind of like the question your asking, highlighted in yellow. But... Question: It won't. The sprite, moves, and cry, or anything related to Tepig didn't even exist when HeartGold was made. So no, you can't. Pokemon made in the Gen.V games (Black/White and Black/White 2) cannot be traded to Gen.IV games (Diamond/Pearl/Platinum/SoulSilver/HeartGold) directly. The Poketransfer Lab on Route 15 in the Gen.V games, however, allows you to move Pokemon from Gen.IV games to Gen.V games via DS Download Play.