As part of its ongoing efforts to promote every single Pokémon out there, The Pokémon Company has shared special content dedicated to Shellder:
Did you know? It swims facing backward by opening and closing its two-piece shell. It is surprisingly fast. Its hard shell repels any kind of attack. It is vulnerable only when its shell is open.
Source: The Pokémon Company
Pokémon Blog 
One thought on “Pokémon GIF: Weezing underestimated Shellder’s strength”