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Talus Cave Boss

For The Legend of Zelda: A Link to the Past & Four Swords on the Game Boy Advance (GBA).

Stage: Talus Cave

From the official guide

The puffy monster that dominates Talus Cave will crush you under its voluminous body and grind you into ice shards—unless your party acts as a team. Everyone must pick up the Pegasus Shoes, then dash against the creature until you push it into the body-chilling wall. After you hack its frozen body several times, it will make a final, frightening transformation. Color is key to its defeat.

The Legend of Zelda: A Link to the Past & Four Swords, The Official Nintendo Player's Guide (Nintendo of America, 2002), p. 117

Boss room

Talus Cave Boss, Boss room