How do you get to blizzard island crevice cave in Pokemon mystery dungeon EOT?

You can't reach Blizzard Island Crevice Cave in Pokemon Mystery Dungeon: Explorers of Time, Darkness, and Sky. That location is exclusive to Pokemon Mystery Dungeon: Explorers of Darkness.

If you are playing Explorers of Darkness, you can access Blizzard Island Crevice Cave after defeating the Darkrai in the Shadowy Grotto. You will be taken there after the battle.

Let me know if you're playing a different game, and I can help you find the location you're looking for!