believe me i know why darkrai is my favourite pokemon .it is so powerful .my darkrai has 402 sp.atk and 346 spd.his moves are :dark void,nightmare,dream eater and calm mind .moreover i gave it mind plate .so, i put the opponent pokemon to sleep with dark void then i use nightmare and then i use dream eater to restore myself and do damage.furthermore darkrai uses its ability bad dreams to do more damage.with this strategy i beat my foes!