Barbaracle’s legs and hands have minds of their own, and they will move independently. But they usually follow the head’s orders.
– Pokémon Y Pokédex
Barbaracle is one of the weirder designs for Pokemon. Its Pokedex entries indicate that each limb is independent, yet they’re considered one Pokemon… I dunno, it’s like the individual “eggs” of Exeggcutes, they’re independent yet together they’re only one Pokemon.
Barbaracle was one of the few Pokemon that wasn’t revealed ahead of X/Y’s release. I remember finding Binacle and evolving it….. and I think I did a triple take.
It actually has decent stats, with good Attack and Defense, and it can Shell Smash for more offensive power.