In the moment that it gulps down its prey, the inside of its shell is exposed, but to this day, no one has ever seen that sight.
The Pokémon cannot be knocked out by a single hit as long as its HP is full. One-hit KO moves will also fail to knock it out.
Hidden Ability
The Pokémon takes no damage from sandstorms. It is also protected from the effects of powders and spores.