You can assign these new custom properties to your Pokémon in Cobblemon using anything that use the PokemonProperties logic, including commands such as /pokespawn and /pokeedit, the result in an evolution in a species or species_addition data file, and the pokemon in a spawn_pool_world data file.

POKERUS_X / POKERUS_Y

The x and y value of the Pokérus infection. Please review the Bulbapedia docs on the technical information for more info.