Shiranui heard the collapse and when he looked over at Chuck, he saw Marshadow.  He pulled out his Pokédex and scanned it.  "[i]Marshadow, the Gloomdweller Pokémon.  It slips into the shadows of others and mimics their powers and movements.  As it improves, it becomes stronger than those it’s imitating.[/i]"
"Could this Marshadow explain Chuck going berserk?" he wondered.