Disclaimer: If I owned Pokémon, you would be able to ride a rocket from the Mossdeep Space Center to the moon and battle a hostile Deoxys. But I don't!
#301 Delcatty
In the wild, it hunts in prides. When captive, it becomes more aggressive and insatiable as it is forced to search for prey alone.
#302 Sableye
Its primarily chemosynthetic digestive system allows it to get most of its nutrients from eating rocks. However, it is also known to suck the blood of goats.
#303 Mawile
A phylogenetic mystery that appears to be unrelated to other chordates. It waits until people draw nears and bites their heads off with its enormous jaws.
#304 Aron
It must eat large iron objects because of its frequent blood loss from territorial scuffles. If it eats a car, it will not stop even if people are inside.
#305 Lairon
Its ability to autotomize its tail to escape death appears to be an evolutionary relic, as it is an apex predator. Miners who encounter it in a claustrophobic shaft are unlikely to escape being killed and eaten.
#306 Aggron
An extant ceratopsian of remote, rocky locales. It will intentionally cause mudslides to destroy humans who settle in its mountain home.
#307 Meditite
It lives a stringently ascetic lifestyle. If it accidentally experiences pleasure, it will commit suicide to preserve its honor.
#308 Medicham
They guard the way to Shambhala. They perform an unsettling dance before sacrificing the unenlightened.
#309 Electrike
It uses electricity to start fires. It is a popular pet but often chews the wires out of homes, leaving them exposed and energized.
#310 Manectric
Its howl calls the pack to assemble, generating a storm overhead. It goes for the neck with its sparking jaws.
#311 Plusle
A failed attempt to clone a Pikachu. It turned out hyperactive and dangerously erratic.
#312 Minun
A failed attempt to clone a Pikachu. It turned out mentally retarded and short-lived.
#313 Volbeat
Its beautiful lights are a timeless symbol of summer. It uses so much energy generating the glow that it cuts its own lifespan drastically.
#314 Illumise
It gives off a fragrance similar to lavender. Some old Illumise who have failed to attract Volbeat grow bitter and kill young men for revenge.
#315 Roselia
It opens its petals at dawn and closes them when the sun sets. It is more often grown for its toxic thorns than its beautiful flowers.
#316 Gulpin
A witch was spurned by a handsome youth. To get revenge, she cast a spell on his stomach, which he vomited up as a Gulpin.
#317 Swalot
A nightmarish, multicellular protist adapted to life on land. It swallows people whole and dissolves them in acid over a period of up to two days.
#318 Carvanha
Although it is a vicious carnivore, it is more closely related to the silver dollar than other piranhas. A group can strip the skin off a Miltank that wanders into their river in seven seconds.
#319 Sharpedo
Unlike most fish, it must feed constantly to keep its digestive system in working order. It can smell human blood from up to fifty miles away in the water.
#320 Wailmer
A large species of plankton that drifts through the pelagic sea. More ships sink from crashing into Wailmer than icebergs.
#321 Wailord
A toothed whale that hunts both in pods and alone. It can dive to the bottom of deep-sea trenches, returning with huge sucker scars inflicted by an unknown creature of the abyss.
#322 Numel
A Bedouin tribe ferments a unique liquor in its blisteringly hot hump. When it has matured enough to drink, the Numel is killed so its body will cool.
#323 Camerupt
It serves as a hardy mount in harsh deserts. However, those who ride it may slip into one of its humps and boil in the molten magma.
#324 Torkoal
The steam it ejects has an extremely high heat content. If you approach it, your internal organs may boil away into the air.
#325 Spoink
Young Spoink imitate their parents by placing a pearl on their heads. In older individuals, the "pearl" is actually a brain tumor caused by overuse of its psychic abilities.