Pk diamond pokerus....

my level 100 rayquaza apparently got the pokerus thats what nurs joy told me but i looked at some youtube videos and the pokemon in the video who have the virus it is written pkrs next to there level but my rayquaza theres nothing theres just a little face next to where u can mark a pk look like the im icon... im battling the league and so far none of my other pk have it yet... im on my 4 battles any suggestions...