Kakinbatank

Shield Pusher (currently has no official name) is encountered in first Wily stage in Mega Man 9. It's a large robot on treads and initially holding a shield. When disturbed, it will attempt to crush Mega Man with its shield. After that it starts shooting. Since it's a large-sized enemy, it's resistant to Black Hole Bomb and Tornado Blow. However, Laser Trident can pass through its shield.