An infected Marowak..
Species: Bone Keeper Pokemon
Oddly, despite being dead and no longer retaining memories from its previous life (for the most part) Marowak infected with the virus still continue their old habit of collecting bones. However now they not only collect bones of long dead Pokemon but also fresh ones from their victims, which they extract with their sharp claws after bashing in the skulls of their prey with their bone "clubs".
Like several types of Pokemon whom are infected Marowak are only "Alive" for a short period of time, for them it is because for some unknown reason the virus forces their heads within their masks to expand until is bursts their masks and kills them.
Danger Level: 5
While encountering one of these creatures can prove extremely dangerous they are not able to survive long after infection and thus simply avoiding them as well as possible is the easiest way to defeat them.
(NOTE/Fun Stuff: Another Pokemon whom I don't have much experience with. I like the way they look, kind of like cute little Poke-Hollows but they just don't seem very useful to me. Of course I still always try to catch Cubones Mother but it never works :/ )