1)You must be very lucky to have goten this stats condition.
2)PKRS is a virus that infects one of you Pokemon on your team and will spread to all your Pokemon on your team eventally.
3)This rare virus will increase the earnings of EV you gain from defeating a foe. This is like the Macho Brace, but it will not decrease your speed at all. Be carful this virus will disappear if you get a stat condition such as Burn, Paralysis, Poison, and Sleep.
Yawn - what is there to say?