Disclaimer: If I owned Pokémon, Spearow would be extinct due to competitive exclusion from Pidgey. But I don't!
#276 Taillow
An enormous flock once returned to a colonial mission on the same day every year. Eventually, pioneers shot them for all for food.
#277 Swellow
When clean, its breast is actually white. The red appearance is caused by blood stains when it eats voraciously.
#278 Wingull
Its raucous call is a common sound in coastal towns. Wingull only fly out to sea to die.
#279 Pelipper
The acids in its bill partially digest meals before it regurgitates them for its chicks. It usually swallows prey alive.
#280 Ralts
An sensitive Pokémon that becomes stronger by feeding on bitter emotions. It was once a child abandoned by its parents.
#281 Kirlia
Their dance drives them, and all who watch it, into an ecstatic frenzy. In their madness, the dancers rip apart wild animals and devour their flesh.
#282 Gardevoir
Its womanlike body is merely an illusion created by a powerful glamour field. Its true form is a hovering, eyeless blob with a gaping mouth.
#283 Surskit
They gather in swarms enormous enough to cover entire bodies of water. Their presence prevents other creatures from drinking, causing numerous deaths during droughts.
#284 Masquerain
It is an adept flier, capable of reaching any aerial location and hovering in place. It drinks from the eyes of larger creatures.
#285 Shroomish
Many dance clubs keep a live Shroomish on hand. Ecstatic dancers bite off pieces to enhance their revelry.
#286 Breloom
A species of kangaroo that feeds on a certain type of fungus. When the mushroom began to grow on its head, it became more aggressive.
#287 Slakoth
A toxic algae grows on its back. The cyanobacteria induces drowsiness in people who approach before it overwhelms their system and kills them.
#288 Vigoroth
A docile species of sloth was injected with anabolic steroids. The experiment increased its strength but filled it with boundless rage.
#289 Slaking
Although it has a reputation for laziness, it is very active during the early hours of the morning. It is known to abduct human women.
#290 Nincada
They stay buried underground for 17 years before emerging. Their hum drives dogs to madness.
#291 Ninjask
Although it is commonly believed to be the adult form of Nincada, this is not actually the case. Rather, it is a ruthless predator that eats Nincada emerging from their shells.
#292 Shedinja
The soul of a Nincada eaten by a Ninjask. It is a spiteful spirit that carries out the vengeance unconsciously desired by its Trainer.
#293 Whismur
Its cries are horribly loud. Their vibrations are enough to cause cave-ins, killing the same Whismur who made them.
#294 Loudred
It hunts using pressurized sonic waves. All Loudred Trainers eventually become deaf from the intense noise.
#295 Exploud
It can generate both infrasonic and ultrasonic waves. The holes in its body are torn open because of the intense pressure of the sound produced within.
#296 Makuhita
The population was isolated on a Hoenn island and subjected to genetic drift. As a result, the skin over its skull has loosened, and must be tied up to prevent it from slipping off.
#297 Hariyama
It builds up its body to astounding bulk. If it becomes too large, its weak bones may be crushed under its own weight.
#298 Azurill
A juvenile Pokémon that lives in marsh grass nests. If it is placed in the water at too early an age, it will be unable to swim and will drown.
#299 Nosepass
Once a man awoke to find his nose missing. He discovered that it had transformed into a Nosepass and taken a high position in the gym he worked at.
#300 Skitty
A wild cat of rocky crags. Those who consider it cute and fluffy would do well to watch nature documentaries examining its hunting behavior.