Where is the ancientpower TM on Pokemon Mystery Dungeon explorers of sky?

In Pokémon Mystery Dungeon: Explorers of Sky, the Ancientpower TM can be found in the Hidden Land. Specifically, you can obtain it by defeating the boss Pokémon in the dungeon known as the "Ancient Relic." After defeating the boss, you'll receive the TM as a reward. Make sure to explore thoroughly, as some items can be hidden in different areas of the dungeon.