There are 3, they will come on their own as part of the level.
To catch them, you don't hide, and let them find you. Then, don't dodge them when the minigame starts, and a second minigame (press the button on the screen) will start. Successfully complete it, you catch a Spyfly.
Vote John McCain / Sarah Palin on November 4th, 2008 The Ticket for America