At some point during the last few years, the volcanic Cinnabar Island erupted. The Pokémon Center has been rebuilt, but the rest of the town remains either buried in rubble or swept into the sea. It is here that you meet Blue, contemplating the power of nature. The former Champion and current Gym Leader refuses to return to his post at the Viridian Gym. In order to persuade him, you must first collect the seven other Kanto Gym Badges. To earn the seventh, you need to track down the Gym Leader of the displaced Cinnabar Gym. With the building destroyed, Blaine was forced to relocate to a cave in the Seafoam Islands to the east.
Blaine's quiz machines were destroyed, so there are no puzzles to solve. However, none of his six Gym Trainers will approach when you step into their line of sight. Each one is stationed at a choke-point and will not move until they are defeated. To reach the central area, it is necessary to approach from the western side, as Super Nerd Merle is the only one of the three nearest the Gym Leader that does not block the path upon defeat.
The Gym Leader is a Fire-type specialist, so you may want to bring a few Burn Heals. All three of his Pokémon are susceptible to Water- and Ground-type moves, but his Magcargo is especially vulnerable. Though his Pokémon are at respectable levels, they still should not pose much of a threat at this point. Despite this, Water Pokémon should still be careful of Magmar's ThunderPunch. Each of his Pokémon carries a White Herb, which prevents Overheat's Special Attack drop for a single turn.
The Seafoam Islands are a pair of islands situated in the center of Route 20. The icy caves beneath these islands are full of twists and turns, and a legendary Pokémon makes its home on the lowest floor.
When you first descend into the icy caves, you begin in the southeastern part of B1F. Move the boulders aside and collect the Grip Claw in the dead-end path to the north. Walk up onto the nearest platform to reach an Ice Heal and climb down the northernmost ladder.
Walk down the stairway and slide across the ice patch. Inspect the two frozen stalagmites to the north to find a hidden Pearl. Turn right and battle past Skier Cady, Boarder Shaun, and Boarder Bryce to reach the northeast ladder.
Head southwest and pick up the Max Revive lying hidden between two stalagmites. Take the ladder down to B4F.
Go north to find TM13 (Ice Beam), and climb back up the ladder.
Head northwest, and move the boulder two paces northward. Circle around to the east side of the ice patch. Slide westward to the boulder, then north to reach another ladder.
Pass by Boarder Bryce again, jump the ledge to the south, and climb the ladder.
Go west and climb down the nearest ladder on the lower level.
Pick up the Water Stone, jump the ledge, and take the ladder back to B1F.
Head north onto the upper level and climb down the ladder.
Circle around past the three Trainers and climb down the northeast ladder.
Go southwest to find three blocks sitting on an ice patch. Clear two of the three blocks out of the way by bumping into them from the north or south, sending them skidding away. Approach the third block from the east, which creates a stopping point that will allow you to continue westward. Another ice patch lies a short distance to the northwest. Bump the northeast block from the south, push the northwest block from the west, then slide clockwise from the southern edge of the ice to reach the Big Pearl. Climb down the ladder to the southwest.
Navigate the central part of the floor to reach the islet in the center, and climb the ladder.
Climb up the next ladder to B2F.
Cross the bridge and climb down the ladder in the southeast.
Take the next ladder down to the bottom floor.
Step into the water and surf westward. The nearest islet is the roost of Articuno, the first of Kanto's three legendary birds. Begin the battle with Fire-, Electric-, and Steel-type moves to weaken its health quickly, then follow up with Grass and Bug moves to wear it down further. If you fail to catch it, defeat the Pokémon League once more to cause it to reappear.
In the time it took to return to the beach near Fuchsia City, the debris from the Cinnabar eruption has been cleared away. Fight the Swimmers here for some quick cash, then fly back to Viridian to battle for the final Badge.