At the lab of professor oak, he found out that team rocket made Mewtwo, a clone of mew. Oak said to himself "i can do better" and he did, he studied the unova pokemon zekrom and made a clone. The clone was a sucesse, well that what he thought. During the events of creepy black GHOST killed red and then he targeted oak and killed him leaving his experiment infected with a zombie disease but the clone was designed to avoid any type of disease *not all* the zombie disease was one of them. However a small bit of it had a effect to change form when the thing that started the infection *in this case buried alive* is at his last dying breath.