Some "Highlights" From the USUM Pokedex [Kanto Edition]

Caterpie: Its body is soft and weak. In nature, its perpetual fate is to be seen by others as food.
Metapod: Its hard shell doesn't crack a bit even if Pikipek pecks at it, but it will tip over, spilling out its insides.
Rattata: Its incisors grow continuously throughout its life. If its incisors get too long, this Pokémon becomes unable to eat, and it starves to death.
Ekans: The eggs of bird Pokémon are its favorite food. It swallows eggs whole, so sometimes an egg gets stuck, and Ekans faints.
Paras: The mushrooms, known as tochukaso, are controlling the bug. Even if the bug bugs the mushrooms, they tell it to bug off.
Parasect: The bug is mostly dead, with the mushroom on its back having become the main body. If the mushroom comes off, the bug stops moving.
Graveler: It travels by rolling down cliffs. If it falls into a river, it will explode with its last gasp.
Gastly: Poisonous gas comprises 95% of its body. It's said that the remaining 5% is made up of the souls of those who died from the gas.
Haunter: It's dangerous to go outside alone on nights when you're feeling sad. Haunter will catch you, and you won't be able to go back home.
Gengar: Even your home isn't safe. Gengar will lurk in whatever dark corner of a room it can find and wait for its chance to catch its prey.
Gengar Mega: It tries to take the lives of anyone and everyone. It will even try to curse the Trainer who is its master!
Lickitung: It licks filth clean with its tongue. Whatever it licks always stinks afterward, so whether it's really clean is...questionable.
Kangaskhan Mega: When the mother sees the back of her Mega- Evolved child, it makes her think of the day when her child will inevitably leave her.