Pokémon FireRed and LeafGreen/Seafoam Islands

You can't get through Seafoam Island unless you have a Pokémon that knows Strength

After you enter the cave, go east and push the boulder into the hole to the north. Now go to the steps north of the entrance and go up. Grab the Ice Heal.

Also you can catch the legendary Pokémon.

LEGENDARY CAPTURE: ARTICUNO
 * Lvl: 40
 * Difficulty: Hard

Rock Slide is even more useful, my Graveler took it to around 2-3 HP, (of course this is just what I observed), then three Ultra Balls caught it.--Nevfx 04:14, 17 July 2007 (CDT)