Shiranui investigated the "deadly" sand and heard Mike's take on the situation.  He called Zoro out and had the Zoroark (disguised as Mike's Decidueye) on standby.  He scanned the Sandygast after Hood's attack revealed its true form.  "[i]Sandygast, the Sand Heap Pokémon.  Born from a sand mound playfully built by a child, this Pokémon embodies the grudges of the departed.  It takes control of anyone who puts a hand in its mouth.  And so it adds to the accumulation of its sand-mound body.[/i]"
"This one's a shiny," he deduced after comparing the Pokédex's image with the Pokémon in question, "Mike, you're right about the species."