Thornbobber

The Thornbobber walks side to side, roughly following the position of a swarm of Pikmin in hopes of blocking them with its spiked stomach. When Pikmin approach, it pulls up its stomach and then releases it when they walk underneath, crushing them. It can also swat them away should they attempt to walk around it. Pikmin thrown directly onto its stomach don't fare much better as they end up stunned by the sharp spikes, and its purple armor is too smooth for Pikmin to get a hold on. Fortunately, this resilient creature's weakness revolves around its crushing stomach; Rock Pikmin thrown at the Thornbobber's stomach will disrupt its balance and prevent it from moving for a few seconds while it tries to reorient itself, allowing the creature to be walked around; act quickly, however, as the spiked stomach will soon rebound in the opposite direction and whack any Pikmin or leaders still in front of it. Once maneuvered around, the Thornbobber can still try to swing its stomach into targets behind it, but it cannot turn around to protect its uncovered backside, which Pikmin can be thrown onto to easily defeat the creature.