Gynamite

A crab-like monster with shape shifting powers who is sent after a girl named Tomoko, who is half Crisisian on the side of her father is about to awaken her powers. Though Kotaro interfered, Gynamite assumes the form of the girl's father to get her, only she uses her Crisisian powers to knock him into his true form as Kotaro arrives and becomes RX to fight him, chopping his pincer off before the monster used his toxic breath on him. Gynamite tried again to take the girl who used her Crisisian powers on him. RX used his RX Kick on Mite before he was destroyed by RX's Revolcane. Episode 8