He doesn't rebuild his gym. He moves to the Seafoam Islands.
Blaine is the gym leader in Cinnabar Island. When you get to Cinnabar Island the door to the gym is locked, you need to go to the Pokemon Mansion to retrieve the key. Once you have it you get to the gym and battle Blaine to get your seventh badge.
A volcano erupted on Cinnabar Island, destroying the gym, so he had to relocate to the Seafoam Islands
The 7th leader is Blaine. He uses fire pokemon.
After you get HM03 (Surf) and beat Koga, you have to fly to Pallet Town and surf to Cinnabar Island. After you are there you have to go to the Cinnabar Mansion and find the Secret Key and Use it to unlock the door of the gym. After you are in the gym you must answers a series of questions or face the gym trainers. Then you can face Blaine for the Volcano Badge. His team is a level 48 Ninetales, a level 50 Rapidash, and a level 54 Arcanine.
Blaine can be found iin Cinabar island after you get the key from the burned place thats on cinnabar island so once u get it go to the gym to fight him
In his gym
Blaine is the gym leader in Cinnabar Island. When you get to Cinnabar Island the door to the gym is locked, you need to go to the Pokemon Mansion to retrieve the key. Once you have it you get to the gym and battle Blaine to get your seventh badge.
Unfortunately, Cinnibar Island is never rebuilt. The place remains in ruins for the game. Blaine continues to stay in his "made" gym.
seafoam islands; 15th gym
Blaine.
To get to Blaine, he is on cinnabar, but the last gym leader... He is in one of the towns once you defeat Blaine, I think it was Viridian or Vermillion. =)
volcano badge
Blaine's Gym is in Mahogany Town.
Blaine's gym is in the Seafoam Islands
The seventh gym (Blaine's) used to be on Cinnabar Island. After the town was destroyed by the volcano, Blaine has relocated his gym to the Seafoam Islands. Just Surf east of Cinnabar, and you will reach him.
blaine is a fire type gym leader and is located right of cinnabar town so I suggest u use maybe a water type and/or a ground type
the last gym leader is Blue.When you go to the seventh gym leader Blaine you should see Blue and asks you if you have 7 badges then you beat Blaine and go to Blue and he says to meet him at his gym