After you defeat the Elite Four and have all 16 badges, talk to Professor Oak in Pallet Town. He will give you Rock Climb (HM 08) which is necessary to access Mt. Silver.
Go through Route 22 to reach Mt. Silver. All you will need is rock climb to continue going up the mountain, and at the top will be Red.
You will be able to battle him again after you defeat the Elite Four once more. Keep defeating the Elite Four to continue battling Red.
I don't think you can battle Gardenia in Pokemon HeartGold.
let your Pokemon battle
No they can't.
No, you can't battle Maylene and/or Crasher Wake in Heartgold.
To re battle red u must defeat the e4. After u beat the e4 red will reappear. do this as much as pleased
Ash is not in Pokemon HeartGold, but Red is able to battle on the Summit of Mt. Silver.
Catch moltres and battle red
you cant battle ash in this game although you do battle red on mt silver
no but trainer red is basically ash
I don't think you can battle Gardenia in Pokemon HeartGold.
red dont have a gym,but hes deep somewhere in mt.silver.
Yes just go back to Mt. Silver
Yes it is. In fact, it is the only 100% guaranteed Pokemon to be shiny.
let your Pokemon battle
No they can't.
He does not appear in Pokemon Black or White. He only appears in Gold, Silver, Crystal, HeartGold and Soulsilver if you want to battle him.
No, Pokémon HeartGold's Red is not Ash.