Northcoast's Gym specializes in Ice Pokemon, therefore any fire-type pokemon are best suited for this gym badge. In order to make your way to Irene, you first have to open the ice paths by activating the blue pads. Once you defeat Snowboarder Mykal, you will run into Percy. After your battle, he will give you HM03 (Surf). Upon beating Irene, you will receive the Icicle Badge, which allows you to use the move Surf outside of combat. It also boosts the defense of your party. Irene also gives you TM13 (Ice Beam).