RT-55J

RT-55J is the sub-boss of Sting Chameleon's stage, a big sumo wrestler robot. It guards the capsule where the Body Part (Arm Part in Mega Man Maverick Hunter X) upgrade can be found. In the remake Mega Man Maverick Hunter X and the Rockman X manga, it talks with a robotic voice. Its body is very resistant, and its weak points are the red dots on its body, and its head. It punches, jumps, and tries to catch the player with its extendable claws. Note that this sub-boss is tougher than almost any other enemy in the game; this thing has 250 health! (Measured by MegamanXFan). If you have the buster upgrade, keep charging to full level. If not, don't waste time charging, just shoot him rapidly. A good stratagey is, wall-jump up a wall while hes jumping at you, then jump over and in front of him. He will try to jump on you or try to grav you with one of his claws. If he uses his claw, dash out of range and rapidly attack him. It will cause much more damage than a single charged shot.

Trivia

 * RT-55J is similar to Auto, though its head resembles that of a Scrap Robo.
 * In fandom, it's said that RT-55J was created by Dr. Light to protect the capsule, and some say that RT-55J is an upgrade of Auto.
 * Another similarity is in the names, RightoT (Auto's Japanese name) and RT-55J.
 * Two unnamed robots from Mega Man Zero that join the Resistance after the second mission bear some resemblance to RT-55J, although they are smaller and orange in color.