Secret Base

Spread across the Hoenn region are caves, trees, and bushes which are perfect to hold a secret base for a Pokémon trainer. These locations can be opened when a Pokémon uses the move Secret Power at: a wall with a small indent; a tree with vines; or where a clump of grass may be moved.

A trainer may decorate their secret base with big and small dolls, mats, desks, chairs, plants, cushions, posters and ornaments, filling the base with up to 16 decorations.

If two players mix records, their secret bases copy over, as well as the bases of anyone else they're mixed records with. Entering one of these bases reveals a trainer who represents another player, including their trainer name, secret base decorations, and Pokémon team without its nicknames. This trainer can be challenged to a battle.

A trainer can run in his or her secret base (and perhaps a friend's secret base), but cannot ride a bike.

A boy in Mossdeep City reminds a player of where their own secret base is located.