Disclaimer: If I owned Pokémon, Zubat would be everywhere. Even in Pokémon Centers. Even in your house, hovering over your modern game console. But I don't!
#526 Gigalith
Its skin is extremely thin on some areas of its body, showing the red blood underneath. Ordering it to use a powerful attack will likely puncture one of these areas and kill it.
#527 Woobat
A bat that adapted to terrestrial life in a predator-free environment, it is now threatened by invasive Purrloin. In some houses, it can be found eating dust noisily under beds.
#528 Swoobat
Courting males emit pheromones that affect nearly all eutherian mammals. Those who inhale them become dangerously amorous and lust-crazed for several hours.
#529 Drilbur
It is not a true mole, but performs similar ecological functions as a result of convergent evolution. If one is poisoned, many will return to wreck the killer's garden, sometimes with an odd poison of unknown origin.
#530 Excadrill
They are employed by construction firms to dig tunnels, especially for railroads. If not paid adequately, they will dispatch the human project leaders one by one.
#531 Audino
For some reason, the majority of Trainers systematically seek out and kill them. As a result, they are expected to become extinct within a few years.
#532 Timburr
A group of Timburr have formed a tribe in a remote tropical rainforest. They are known to roast alive Trainers who enter the region in search of Tropius.
#533 Gurdurr
A clown that was driven mad by its inability to make children laugh. Instead, it began to cultivate its ability to make them scream.
#534 Conkeldurr
They are commonly hired by construction companies. Their nearly universal harassment of females sometimes goes beyond harmless cat-calling.
#535 Tympole
The glands on its head, which produce sonic vibrations, can be turned into small drums after its death. If it is stranded on land, it will loudly flop around for several minutes and die, attacking anyone who comes near.
#536 Palpitoad
It is one of the first species to suffer when an ecosystem becomes unhealthy. If subjected to stress, for instance in battle, its warts may burst open, killing it.
#537 Seismitoad
Native to the tropics, it has been introduced to temperate marshes, where it has surprisingly thrived. In these new environments, its poison seeps into the water and kills nearly all native species.
#538 Throh
A Throh formed a collectivist commune in a large forest. After its plan to industrialize the area failed, it executed its enemies in a ruthless purge.
#539 Sawk
A Sawk took over a large forest by appealing to anti-human sentiments. It massed an army of Pokémon to commit horrific acts of genocide.
#540 Sewaddle
A Sewaddle sewed a gown of leaves for a beautiful princess. When she refused to wear the tattered garment, it became angry and sewed her an airtight burial shroud.
#541 Swadloon
A crude shelter of leaves designed to protect larva. If the many hungry grubs writhing inside are not fed constantly, they will coordinate their movements and seek nourishment out themselves, seeming to move as one creature.
#542 Leavanny
In a classic Unovan fable, a Leavanny whiles away the summer whistling and sewing clothes while a Durant collects food. In the winter, the Durant freezes to death and the Leavanny eats from its food store.
#543 Venipede
After it stings an aggressor, it plants its stinger in the creature's flesh. This behavior ensures that the victim will die, but also that the Venipede will die as well.
#544 Whirlipede
To remain safe from predators, it is almost never seen uncurled. If forcibly unrolled, it will wrap around its attacker's leg and inject horrible poisons.
#545 Scolipede
A huge venomous centipede of the tropics. Just one can level an entire village and kill of its inhabitants- it is considered the most deadly extant insect in the world.
#546 Cottonee
Its production fueled the mechanization that launched the industrial revolution. It is grown on huge plantations using slave labor.
#547 Whimsicott
Explorers of the east brought back wild tales of its existence. These stories fueled further expeditions to the area, which eventually allowed a flourishing slave trade to develop.
#548 Petilil
An Asian plant introduced to the western world a few centuries ago. It is traditionally planted over a child's grave.
#549 Liligant
It shakes its petals in a manner similar to that of butterflies, attracting them for pollination. Since it is self-fertile, it prevents competition by killing the insects before they move on to another plant.
#550 Basculin
Its two forms provide an example of sympatric speciation based on mating preference. If it sees clothing of the opposite color, it will become enraged and violently drag the wearer underwater.