Mega Mech Shark

This unnamed boss, nicknamed "Shark Submarine", is the boss of Wily Castle 2 in Mega Man 9. It's divided in three phases: The first part is the tail and releases homing missiles. The second part is the body, which has spikes on it and two hatches that releases small enemies. The last part is its head, which releases several lasers from the mouth.

All parts are weak to Tornado Blow and Laser Trident, but it's recommended to use Tornado Blow only in the middle part, leaving Laser Trident and Hornet Chaser to the first and third parts, and Magma Bazooka if they are out of energy.

The Shark Submarine also appears in the Special Stage as a mini-boss.

Trivia

 * This boss is, to a cetain extent, similar to the U-555 miniboss in Duff McWhalen's stage in Mega Man X5. They are both fought in three sections (head, tail, fin), although the order you fight them is different.