Pokémon Ruby and Sapphire/Pokérus

Pokerus is a virus that is beneficial to the growth of your POKeMON. Usually it is caught from a wild POKeMON, when you go to a Pokemon Center, the nurse will reply with this: ''Your POKeMON may be inflected with Pokerus. Little is known about the Pokerus except that they are microscopic life forms that attach to POKeMON. While infected POKeMON are said to grow exceptionally well.'' When placed in your party it will infect other POKeMON in your party. When put in your PC the rate that it will disappear, and not infect any other POKeMON. When it has it pkRS appears on the stat screen. After it disappears a dot remains in its place.