I was lucky enough to find Pokerus on an old copy of SoulSilver, and I was wondering: if I were to get my Pokerus-infected Flareon to my copy of Y through the use of PokeTransfer and PokeTransporter, would Flareon keep the Pokerus?
Asking because according to Bulbapedia, something like this can happen in Gen 1, and I'm just cautious that something may happen to the Pokerus while transferring Flareon.
If a Pokémon with any stage of Pokérus (active or cured) is traded back to a Generation I game, or withdrawn from Stadium 2 by a Generation I game, all traces of that Pokémon having had Pokérus will disappear. This is because a Pokémon's Pokérus status is not saved in any form in the Generation I games, thereby making it possible for a Pokémon to legitimately contract Pokérus multiple times by trading it back and forth, once it becomes cured of a given infection.