Crystal Cave

Introduction
The Crystal Cave was Mewtwo's base. In this dark cave Mewtwo started his evil plans and the idea of the Hydra Project. It is said that the Crystal's there gave incredible power boosts to psychic Pokemon and that is probably the reason that Mewtwo chose this place for his diabolical plans, that included tracking millions of Pokemon all over the world.

Location
The Crystal Cave is located beyond a certain desert. The location of it is not fully known but it is in the eastern part of the world, beyond the Spikes and Arrows Kingdom.