Pokerus is a virus that infects your Pokemon. It catches this virus from a wild Pokemon that also has pokerus. If you keep a Pokemon with pokerus in you party, your other party members will also get this virus. However, this is a good virus as it doubles the EVs you earn from battles. Your Pokemon will eventually lose pokerus in four days but you can preserve it by keepin it in PC and allowing your other pokemons catching it.
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It means that that certain Pokemon had pokerus and is no longer able to get pokerus again
Pokerus happens at random, it is about as rare a finding a shiny pokemon.
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To get your emerald Pokemon to platinum you transfer them in pal park.
It appears randomly like shiny Pokemon. It is like a status and is obtainable by catching a wild Pokemon that is infected with Pokerus. To spread it, simply put it into your party and all the Pokemon in your party will be infected in no time.