Childhood Enhanced - Nintedo's Rogues' Gallery

Oh goodie, the SA-X. Absolutely LOVED hearing those footsteps.

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In Pokemon Pearl/Diamond you enter a haunted house, when you check a TV lying there, Rotom appears, is a Ghost/Electric Pokemon.

In Black 2/White 2 version, you find an abandoned mansion and the ghost of a girl, you have to follow her in order to be able to get out.