This is the End! Monkie Kid : Season 2 Episode 10

After gathering the secret ingredients, the Lady Bone Demon creates a powerful bone mech which she uses to attack MK while he is out training with his friends. MK fights using his newly acquired skills, but the Lady Bone Demon defeats him and his friends, and in the end even MK is defeated in a disadvantageous situation. Our hero desperately needs someone's help to somehow survive and win again...