Disclaimer: If I owned Pokémon, both prezygotic and postzygotic barriers to fertilization would prevent Skitty from mating with Wailord. But I don't!
#051 Dugtrio
Three Diglett have fused into one, forming a gaping mouth with their posterior bodies. The mouth churns soil through propeller-like teeth and can easily shred other substances as well.
#052 Meowth
Its gold coin is very valuable. Its mother slashed open its forehead and inserted the charm soon after birth to ensure good luck.
#053 Persian
The gem on its forehead glows when it senses a person with evil intentions. The glow is accompanied by a pleasant warmth that makes the Persian purr with delight.
#054 Psyduck
The delta waves it produces have strange effects on humans. Many Psyduck Trainers begin to distrust the government and cut off ties with their friends.
#055 Golduck
A legendary creature that lurks in mountain pools. Its favorite food is the cucumber, but it will readily settle for intestines.
#056 Mankey
It was once a docile creature. However, after about one hundred individual Mankey were mistreated at zoos around the world, the entire species somehow became horrifically violent.
#057 Primeape
No researcher has managed to observe wild Primeape for more than a few hours. It will attack any human for no reason, and continue fighting until the victim is dead.
#058 Growlithe
They will obey any command given by their Trainers. The extent of their loyalty was proven during the last world war.
#059 Arcanine
They were once revered as gods. However, a group of devotees successfully drowned one in a test of divinity, and they have not been worshiped since.
#060 Poliwag
It will try to hypnotize and drown aggressors. However, it can easily be subdued by stabbing its chest, causing all its internal organs to spill out.
#061 Poliwhirl
It is a pedomorphic species which metamorphoses into an adult form when treated with iodine. If exposed to very high molarities, its organs will grow too quickly to fit into its body, and it will die.
#062 Poliwrath
The only true extant marine amphibian, it challenges ocean swimmers to races. It kills those who lose.
#063 Abra
They teleport to escape danger. Inexperienced individuals often teleport into solid rock, killing themselves instantly.
#064 Kadabra
Although it is favored by Trainers for its awesome psychic powers, it gives off strong ionizing radiation. Most Kadabra Trainers eventually develop a form of cancer.
#065 Alakazam
Unlike those of humans, its neurons are capable of mitotic division, allowing its intelligence to continually increase. However, for unknown reasons, every Alakazam studied has suddenly opened its eyes widely and fallen over dead upon its 30th birthday.
#066 Machop
A hormone from its adrenal gland gives it incredible strength. It is fatally and illegally extracted for use by human bodybuilders, often at the price of disturbing side effects.
#067 Machoke
Its belt continually secretes chemicals inhibiting acetylcholine transmission to its muscles. If unrestrained, its muscles would go into overdrive and burst out of its skin.
#068 Machamp
It must eat meat several times a day to provide protein for its muscles. It can easily overpower any human.
#069 Bellsprout
It grows in acidic bogs, where it gains necessary nitrogen through trapping insects. Strangely, bog mummies are often found in conjunction with clumps of Bellsprout.
#070 Weepinbell
It hangs on high branches in tropical rainforest canopies. If it senses an animal underneath, it drops down onto its head and begins to secrete hydrochloric acid.
#071 Victreebel
They grow in colonies in thick southern rainforests. Native tribes sacrifice victims to them and lap up their honey, falling into bacchanalian revelries.
#072 Tentacool
Their transparent bodies allow them to suddenly descend upon beaches in swarms. Few survive the venom they can inject when stinging, even after dehydrating on the sand.
#073 Tentacruel
Its existence was long doubted because no ship has ever survived an attack. It was finally proven by a washed-up carcass, which provided a hypothesis to explain the high proportion of lost ships in tropical waters.
#074 Geodude
It looks like a boulder, so hikers rarely notice it. Their mistake becomes evident when it grabs their ankles and drags them down steep slopes.
#075 Graveler
Since it is capable of a form of chemosynthesis, rocks make up the bulk of its diet. For some reason, it thinks that the human heart is a rock.