Disclaimer: If I owned Pokémon, Devon Corporation would be reviving mesonychids and indricotheres. But I don't!
#351 Castform
An artificial Pokémon created from an isotope of water. If it ever came into contact with the ocean, it would act as a seed crystal and freeze the earth over completely.
#352 Kecleon
If its food is stolen, it will call for other Kecleon to destroy the thief. They will swarm into a battle frenzy and become almost impossible to calm until the thief is duly punished.
#353 Shuppet
Through psychic research, it was determined that it can "taste" subtle differences between hundreds of petty and violent emotions. It possesses dolls and manipulates them to kill.
#354 Banette
It forms a psychic bond with its Trainer, linking them forever. If it is abused, it will stick pins in itself to force its Trainer to share the pain.
#355 Duskull
The more spiteful the human its skull came from, the more powerful it is. It spreads its cloth over people's faces to whisk them to the spirit world.
#356 Dusclops
It can fuse its body with inanimate objects to suck their unused life energy. Afterwards, they appear whitish and fall apart easily.
#357 Tropius
The malombo fruits growing around its neck are delicious to humans. But when a tribe of pygmies ate its actual flesh, all of them perished.
#358 Chimecho
It has a mutualistic relationship with several ghost Pokémon. In return for their protection from other spirits, it chimes to alert them of weak travelers in the area.
#359 Absol
One appeared to warn a town of an mild earthquake, but the villagers threw rocks at it and chased it away. When it sensed a larger disaster, it didn't return to warn them.
#360 Wynaut
It was once a sailor who became trapped on an island of sweet lotus fruits. Its skin appears ragged because it has not yet been fully stitched together.
#361 Snorunt
If mistreated, it will bring financial ruin on its Trainer. It wears the hat of someone who froze to death.
#362 Glalie
An odd Pokémon used as a ball in some traditional sports in mountain valleys. If kicked too hard, it summons an avalanche and eats the snow along with the frozen players.
#363 Spheal
It floats in the water like a buoy. It is easily picked up by flying predators or hungry sailors- its flesh has sustained many circumpolar expeditions.
#364 Sealeo
It digs holes in the ice and hides in the water under them, waiting for prey to draw near. It leaps out onto the ice and tears Piplup apart savagely.
#365 Walrein
Its sensitive vibrissae detect prey such as Wailmer and Dewgong, which it hunts with great agility through the water. It plunges its tusks into its victims to sever their blood supply.
#366 Clamperl
It forms a beautiful pearl to remove impurities from its body. When the pearl is taken to make jewelry, it becomes extremely susceptible to disease and dies.
#367 Huntail
Its body is both sturdy and covered in a buffer secretion that resists acid. It swims into the stomachs of larger animals and eats them from the inside.
#368 Gorebyss
Its spine is curved by the intense pressure of the deep sea. It exudes slime to clog the circulatory systems of prey before sucking their insides out.
#369 Relicanth
Its discovery spurred scientific interest in cryptozoology. The deep-sea explorations that located it were prompted by reports of lobe-finned fish attacking African fishermen.
#370 Luvdisc
It secretes a chemical that causes permanent infatuation. Conservative interest groups have petitioned Devon Corporation to research its application in eradicating homosexuality.
#371 Bagon
It possesses unique bone tissue that grows with great flexibility. Its skull began to grow outside its skin after it tore its head open jumping off cliffs.
#372 Shelgon
It will not emerge from its shell unless nutrients are plentiful. If it grows very old without metamorphosing, the shell crusts over its entire body and suffocates it.
#373 Salamence
Humans who drink its blood gain the ability to understand the speech of flying Pokémon. They report that the Pokémon talk mostly about a mysterious plot against humans due to be initiated within the decade.
#374 Beldum
It was built as a sentry by a lost civilization. It plants a little-understood psychic magnet in the brains of all who see it, allowing it to monitor them constantly.
#375 Metang
An iridium robot with advanced mental and physical abilities. It is drawn to meteorite craters and is often seen scanning them feverishly.