Hello there @Uwuaurora Please accept my apologies for the inconveniences you've faced here. I can see you were unable to catch Darkrai, meaning you will now have to wait quite some time until the next Halloween event to have another chance of obtaining this Mythical Pokemon. Since no action can be taken for such a long time, I'll be locking this topic now. If you require assistance in the future, don't hesitate to create a new topic, and again; my apologies.
Take care.
Houndstone