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Pseudo-legendary, one time only Pokemon.
It's ability is 'Nasty Infection', which causes ailments to last longer or do more damage.
Type changes depending on the environment you level it up in. Comes in 4 forms:
>Pure Poison (Flu)
>Poison/Fire (Fever)
>Poison/Ice (Hypothermia)
>Poison/Grass (Fungal Infection)
It's found in an abandoned Pokemon Center, filled with complex puzzles and lots of locked doors.
The room you find it in contains documents, explaining that a strange new epidemic had been sweeping the area, and scientists were trying to cure it. They failed, and could only contain it.