PokéBase - Pokémon Q&A
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It was first released in the GSC games or Gen II, according to Bulbapedia:

The Pokérus (Japanese: ポケルス Pokérus), from "Pokémon virus", is a microscopic life-form that may attach to Pokémon, first appearing in the Generation II games. It is a beneficial mechanic that a Pokémon can obtain.

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Damn I got sniped
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The Pokérus (Japanese: ポケルス Pokérus), from "Pokémon virus", is a microscopic life-form that may attach to Pokémon, first appearing in the Generation II games.

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