Virogen

Virogen is a Poison/Cosmic-type Pokémon introduced in Generation Neo-I.

It evolves into Viralien when leveled up in the presence of the Viral Reactor (RC)/Bacterial Catalyst (MS) starting at level 28.

Biology
Virogen is a small Pokémon resembling a bacteriophage virus. Bizarre and alien in appearance, this Pokémon is composed of a large head, a thin neck, and several thin legs that jut out like a tripod. It has a nondescript "face" composed of only blinking lights.

Triva
Virogen is based off of viruses, particularly bacteriophages. Their resemblance to alien spacecraft/tripods may be a reference to either the "diseases from other worlds" theory as well as the extraterrestrial antagonists from The War of the Worlds.

Virogen may be a combination of virus and pathogen.