I will be posting an alphabetical list of ridiculous Pokemon Pokedex entries here that show how stupidly overpowered or disturbingly strange many Pokemon can be. If you know of any that aren't already listed, let me know.
[b][u]Overpowered[/u][/b][spoiler][b]Arceus[/b]
It is described in mythology as the Pokémon that shaped the universe with its 1,000 arms.
[b]Dialga[/b]
This Pokémon completely controls the flow of time. It uses its power to travel at will through the past and future.
[b]Ditto[/b]
It has the ability to reconstitute its entire cellular structure to transform into whatever it sees.
[b]Entei[/b]
Volcanoes erupt when it barks.
[b]Grimer[/b]
As it moves, it loses bits of its body from which new Grimer emerge.
[b]Gyarados[/b]
It is capable of destroying entire cities in a rage.
[b]Machamp[/b]
One arm alone can move mountains. Its four ruggedly developed arms can launch a flurry of 1,000 punches in just two seconds.
[b]Magcargo[/b]
Magcargo's body temperature is approximately 18,000 degrees F. Water is vaporized on contact.
[b]Metang[/b]
It flies at over 60 miles per hour. Its body is so tough, even a crash with a jet plane won't leave a scratch.
[b]Palkia[/b]
It has the ability to distort space. Its total control over the boundaries of space enable it to transport itself to faraway places or even other dimensions.
[b]Yveltal[/b]
When its life comes to an end, it absorbs the life energy of every living thing and turns into a cocoon once more.[/spoiler]
[b][u]Strange or Disturbing[/u][/b][spoiler][b]Banette[/b]
A cursed energy permeated the stuffing of a discarded and forgotten plush doll, and so it became a Pokémon over its grudge from being junked. It seeks the child that disowned it.
[b]Chandelure[/b]
It absorbs people's spirits, which it then burns. Being consumed in Chandelure's flame burns up the spirit, leaving the body behind. The spirits burned up in its ominous flame lose their way and wander this world forever.
[b]Dusknoir[/b]
The antenna on its head captures radio waves from the world of spirits that command it to take people there.
[b]Lampent[/b]
It arrives near the moment of death and steals a person's spirit from their body. The spirits it absorbs fuel its baleful fire. It hangs around hospitals waiting for people to pass on.
[b]Litwick[/b]
While shining a light and pretending to be a guide, it leeches off the life force of any who follow it. The life force it absorbs from other living creatures becomes the fuel that it burns.
[b]Phantump[/b]
These Pokémon are stumps possessed by the spirits of children who died while lost in the forest.
[b]Yamask[/b]
Each of them carries a mask that used to be its face when it was human. Sometimes they look at it and cry.[/spoiler]
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"Machamp: ...Its four ruggedly developed arms can launch a flurry of 1,000 punches in just two seconds." Yet it still can't learn mach punch. Magikarp's (Heart)Gold entry: It may jump high on rare occasions, but never more than seven feet. Magikarp's Platinum/B&W entry: A Magikarp living for many years can leap a mountain using Splash. Make up your god damn mind!