Write an article based on this "Go to Four Island. Enter the cave. Walk north over the patch of ice. Go down the hole. Go up the ladder. Walk south over the patches of ice. Go down the hole. Go up the ladder."
From the Pokémon Center, head southeast until you climb down a set of steps and follow the path north. You'll need HM03 Surf to continue north to the cave. You'll see "Icefall Cave" in the upper left of your screen. Use Surf again to go through another cave entrance to the north. The patch will shatter when you step over it. You'll walk over the first ice patch above you, then continue north to break two more patches of ice. Immediately turn west to follow a path that leads to one more patch of ice. Walk over it twice to reveal a hole. You'll see a ladder to the east. This brings you back to the main level on the other side of some rocks you couldn't get by before. There are two patches of ice, but when you walk over the southernmost ice patch twice, you will reveal another hole. You'll appear on a large patch of ice that you slip on. Move south until you come to another ladder. You'll see a PokéBall on the ground. Interact with the PokéBall to learn "HM07 Waterfall. "Waterfall" can be used to scale waterfalls that are blocking your path.