Big Pokey

Mega Pokeys are larger varieties of Pokeys first appearing in Super Mario Galaxy. Their body is twice as large compared to a normal Pokey.

Super Mario Galaxy
Mega Pokeys first appear in Super Mario Galaxy in Good Egg Galaxy and Dusty Dune Galaxy. They attack by slamming the ground. The only way to defeat them is by throwing a coconut at their body, and then stomping or spinning the head.

New Super Mario Bros. U
In New Super Mario Bros. U, Mega Pokeys appear in Morton Koopa Jr.'s boss fight. Morton uses his hammer to knock the invulnerable Pokey segments at the player.

They reappear in New Super Luigi U with the same role.