Altering Cave

The Altering Cave (Japanese: へんげのどうくつ Altering Cave) is a mysterious cave found in, and. Only can be found in it but it would have been possible for the Altering Cave's wild Pokémon to be altered by using Mystery Gift at a Wonder Spot hosted by Nintendo, hence its name. Despite this, no country has ever held an event to make use of this feature.

Location
In, Altering Cave is found north of Six Island on Outcast Island.

In, Altering Cave is found on , on the east bank of the inlet that passes through the center of the route. The entrance of the cave is only open after the undefined enters the Hall of Fame.

Pokémon
All of the unreleased  can be found in the extended area of the  in, except for , which is found in Artisan Cave at the. In addition, their evolutionary lines are all available in as Shadow Pokémon.

Unused event text
This text would appear after the undefined has used Mystery Gift to receive the extra.

Music
The background music played inside is Caves of Mt. Moon. This applies to both and.

In the Pokémon Adventures manga
The Altering Cave was mentioned by Orm in Put Your Beast Foot Forward.

In other languages
Wandelhöhle Cueva Cambiante Grotte Métamo Grotta Mutevole へんげのどうくつ 变化洞窟