Finster's monster Peckster destroyed skyscrapers with just a few pecs. With his large wings, he could blow anything away. Zack tricked it into pecked ballonos and one that was rubber ball, got stuck on his beak. Peckster was destroyed by the Megazord. He was brought back by Finster during Rita and Zedd's Wedding.
Also, Peckster best monster in the scene trick on Zack the Black Ranger to during episode "Fowl Play" on Zyu2.