Dusclops

Ruby: DUSCLOPS’s body is completely hollow - there is nothing at all inside. It is said that its body is like a black hole. This POKéMON will absorb anything into its body, but nothing will ever come back out.

Sapphire: DUSCLOPS absorbs anything, however large the object may be. This POKéMON hypnotizes its foe by waving its hands in a macabre manner and by bringing its single eye to bear. The hypnotized foe is made to do DUSCLOPS’s bidding.

Emerald: It is thought that its body is hollow with only a spectral ball of fire burning inside. However, no one has been able to confirm this theory as fact.

FireRed +2: Its body is entirely hollow. When it opens its mouth, it sucks everything in as if it were a black hole.

Diamond +2: Its body is hollow. It is said that those who look into its body are sucked into the void.

Platinum +5: It seeks drifting will-o’-the-wisps and sucks them into its empty body. What happens inside is a mystery.

HeartGold +2: Anyone who dares peer into its body to see its spectral ball of fire will have their spirit stolen away.

Omega Ruby: Dusclops’s body is completely hollow—there is nothing at all inside. It is said that its body is like a black hole. This Pokémon will absorb anything into its body, but nothing will ever come back out.

Alpha Sapphire: Dusclops absorbs anything, however large the object may be. This Pokémon hypnotizes its foe by waving its hands in a macabre manner and by bringing its single eye to bear. The hypnotized foe is made to do Dusclops’s bidding.

Legends: Arceus: There are rumors that peeking inside its bandage-wrapped body will cause one to get pulled in through the gaps between the bandages, never to return. I've been too scared to verify.