Gamerizer

The Gameriser (ガメライザー) is the boss of the second Wily Stage. It spits flames that can damage and stun Mega Man (like Turbo Man's Scorch Wheel), charge at Mega Man while in its shell, and lift off to send mini-turtles at him.

For the large turtle, hit his head with Wire Coil. For the little turtles, the best bet is with Slash Claw.

Trivia
The name Gameriser is a play of Gamera, a giant turtle monster.