Instructions
Fly, walk or surf to Blackthorn City. If you have not arrived in the city before, you need to walk through the Ice Path. Inside Ice Path, you'll find some new Pokemon, some are of the Dragon type, which will aid you in the battle.
Heal your Pokemon at the Poke Center, and save your game.
Use the computer to create your Pokemon party. Select Pokemon with a Dragon- or Ice-type attack in their moves list. The gym leader in this town uses Dragon-type Pokemon, which are weak to Dragon-type and Ice-type attacks. Note, however, that your Dragon-type Pokemon will also be weak to Dragon-type attacks.
Enter the gym and defeat the trainers there. There are five trainers to challenge: Cool Trainer Paul, who has three Level 34 Dratini; Cool Trainer Martha, with a Level 37 Seadra; Cool Trainer Cody and his team of Level 35 Horsea and Level 36 Seadra;
Cool Trainer Mike, who owns a level 37 Dragonair; and a team of level 34 Dratini and level 36 Dragonair owned by Cool Trainer Lola.
Return to the Poke Center to heal and save your game. If you weren't able to win the gym trainer battles, or they were challenging, return to the ice cave and fight random Pokemon to increase your team's experience levels. Get a Pokemon with an Ice-type move to at least Level 40.
Heal your team once more at the Poke Center and save the game again.
Purchase potions and ethers at the Poke Shop.
Enter the gym and challenge Clair, the gym leader. Her team consists of three Level 37 Dragonairs and a Level 40 Kingdra.
Use the Ice-type or Dragon-type moves to cause maximum damage to Clair's team. If you lose the battle, restart the game from your save point and return to Ice Cave to train more.
Heal your Pokemon with a potion when it is around 25 percent health. If you run out of PP to perform an attack, use an Ether.
Defeat Clair's team to win the Raging badge, and a TM for the move Dragonbreath.