Deoxys (UD)

Deoxys is the boss of the Haunted Mansion in Pokémon: Universal Defender.

History
Deoxys was created as a cyborg - his exterior was robotic, but he had physical organs, blood, and bones. He adapted his robotic exterior to be a lethal machine, but he had one weakness - he could be defeated the same way as a biological organism. He could die of massive blood loss, suffocation, broken bones, etc. Deoxys was altered to be more robotic and less biological, but this created new advantages - he could regenerate still, but had no blood, breath, or bones. Arceus banished him to another dimension - the Haunted Mansion. His original form was restored by Lord Giratina.

In the Games
After the player navigates through the Haunted Mansion, he/she arrives in the basement. Deoxys appears, and the battle begins. The player can access three parts of the dimension during the battle - the basement, the attic, and the garden. Deoxys stays in the basement, but his minions follow the player. Any damage done directly to Deoxys can be healed instantly. However, Deoxys cannot heal any damage done via destroying Heart Spheres. After Deoxys is defeated, a portal will open in the wall of the basement.