The karoma region battle ginnick – exsa shadow, allows you to summon the shadow of your pokemon to fight alongside you, boosting the stats, accuracy of your pokemon, and the chance of multihit attacks to land the max count. Your pokemon can also use a special move called "shadow crush". This move can be used only after summoning exsa shadow. It will cause the shadow to land a powerfull attack and clear off all the stat changes from your pokemon. Most of pokemon has a pure black exsa shadows, but some have a special ones! The pictures above are those special exsa shadows.
by James_the_nickit