What do you have to do to battle the sinnoh gym leaders in kanto or johto in Pokemon heartgold
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There is no possible way to battle the Sinnoh Region Gym Leaders in Pokemon HeartGold. You can only battle and Rematch the Kanto Region and Johto Region Gym Leaders in Pokemon HeartGold.
Hope this helps!
To battle the Sinnoh gym leaders, then you must play Diamond, Pearl, or Platinum version. There is no other way.
You don't battle the Sinnoh Gym Leaders. The only person from the Sinnoh region that you see in this game is Cynthia.
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