Ranging Bloyster
The Ranging Bloyster is a large form of the Toady Bloyster, named for its longer tenticle mouthparts and bigger size. This creature is difficult to beat because it tracks your active pilot. Whatever color your captain's antenna beacon is, the eyes and tail of the Bloyster will change that color, also a different sound is made for each color (red and blue), letting you know it is after you. The best way to beat it is to lead one of the pilots behind the creature and then take the other pilot with Purple Pikmin (if applicable) while the Bloyster faces the divertive pilot and start throwing them on its back or tail while the Bloyster can't face you. If it turns your way, switch to you diversion pilot and wait for the Bloyster to face him again, then switch to your attack squad and repeat if neccasary, eventually, you should take the annoying beast down.
This creature is found only on the last sublevel (7) of the Shower Room, Sublevel 7 of the Hole of Heroes, and the last sublevel (2) of the Giant's Bath in Challenge Mode.