No, Cinnabar Island never gets rebuilt in Pokémon HeartGold.
Well after you defeat 15 gym leaders in Pokemon HeartGold / SoulSilver go to Cinnabar Island and talk to Blue.
Top right of cinnabar island.
on cinnabar island
On cinnabar island
To get to Cinnabar Island, you must go to Pallet Town, and surf down on that water at the bottom until you get there.
Talk to Blue on Cinnabar Island.
He is in the cave on Seafoam Island, which is east from Cinnabar.
at cinnabar island
You go to Cinnabar Island and Blue should be somewhere around the Pokemon Center.-
Cinnabar Island
to battle Blue in Pokemon Heartgold you must defeat the 7th gym leader, then find him on cinnabar island. Talk to him, then he will go back to his gym for you to fight
on cinnabar island
Go east of Cinnabar Island to the Seafoam Islands, the gym leader is there using a cave for his gym.
Easy. Simply get a magmar (get in the safari zone or burned tower) and give it a magmarizer (on cinnabar island) then trade it.
He is found on Cinabar Island, when you get all 15 gym badges then he will go back to his gym.He is on cinnabar island. By a rock climb.
by beating the gym leader
its in seafoam island not cinnabar