Flarmiglarmi

A jellyfish-like alien parasite with teleportation abilities sent to obtain the G Crystal that was stolen by a rogue Crisisian scientist and his daughter Kirara, with RX driving him away as Kirara learns the G Crystal is found by Shigeru and Kengo. Flarmiglarmi later enters Kirara's body, getting the G Crystal from Shigeru as Kotaro arrives. In spite of warning Flarmiglarmi the danger the G Crystal poses for both worlds, RX is forced to fight him with the Arcobattler before killing him with the Revolcane to destroy the G Crystal and the machine it powered. Episode 13