Vanishing Gungaroo

Vanishing Gungaroo, known as Vanishing Galgaroon (バニシング・ガンガルン) in Japan, is one of the Mavericks of Mega Man X7. He actually starts out in a Ride Armor similar to a mother kangaroo, and you have to fight him in a Ride Armor battle. Once his Ride Armor is out, you can pummel him a little bit more before he destroys yours. And once you're both on even ground, use Wind Cutter or Souenbu to finish him.

Stage enemies
Enemies in Vanishing Gungaroo's stage, the Tunnel Base:

Sub Boss: Proto Ride
 * Mega Tortoise
 * Runner Bomb
 * Wall Blaster