From the Super Mario Wiki
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Spy Guys are Shy Guys dressed in camouflage gear. So far, their only appearance is in Paper Mario, where they appear in the Shy Guy's Toy Box. They can attack Mario with either a slingshot or a hammer, changing weapons each time they are attacked. If Mario gets hit by the hammer and fails to guard against it correctly, he loses one of his action commands for several turns. Since Spy Guys always attack with a slingshot outside battle, they are hard to land a First Strike on.