Task List/pkrs lv4
Click the PokéRus host to have a chance of becoming infected with PokéRus. You need to catch it 100 times to proceed to the next, and may we say... harder, task involving this sickness.
Click the "PokéRus" button in the top left corner to go to the host's page. You can also use Alt+P as a shortcut.
For more information on PokéRus, check the Wiki.