Bakkonko is a Remless sent by Tiger's Eye. She and Gittanko attack with a see saw, throwing it at their enemies or jumping on it to send them flying. She appeared in Sailor Moon Super S Episode 14, Double Trouble.
When Tiger's Eye and Hawk's Eye didn't find Pegasus in Mina's dreams, they were about to kill her when the other Sailor Scouts arrived, so they summoned Bakkonko and Gittanko to fight them. The two monsters gained the advantage until Mina transformed into Sailor Venus and used an ultra-powerful Venus Crescent Beam Smash on them, as well as Tiger's Eye and Hawk's Eye. Sailor Mini Moon summoned Pegasus with Crystal Twinkle Bell and Sailor Moon used Moon Gorgeous Meditation to destroy Bakkonko and Gittanko.