Related to: Why is it that hPOKe evolves into the Oddish evolution line if it is a hybrid of Gengar(and other questions)?
It is a glitch Pokemon from Pokemon red and blue: http://bulbapedia.bulbagarden.net/wiki/Missingno.#Kabutops_fossil_form here you go.
Actually, it is a Glitch Pokemon which is known to be the Hybrid of Gengar. hPOKe is also one of the Tallest and Heaviest Glitch Pokemon known. It has the Base Stats of an original Gengar.