General

I have seen the face of evil and it is a yellow bloated weasel with a lightning bolt shoved up its ass.
Widgett Walls, on the now-defunct Coming Attractions website, about Pokémon
You want to know what hell is? It's a movie where a slew of creatures whose names you don't even know communicate just with the syllables of their names. Do you know there are sixty-five different ways of inflecting the word "Pikachu"? DID YOU KNOW THAT? I counted. There wasn't anything else to do.
Widgett Walls, on the now-defunct Coming Attractions website, about the first Pokémon movie
For those of you who forgot, the idea of Pokémon is that eleven year old Ash Ketchum has decided to quit school and with the approval of his mother, gone out into the world to capture innocent little vermin and force them to fight each other.
Now if you'll excuse me, I have to find out who this Cubone guy is. Any cute cartoon animal who wears the skull of one of his defeated enemies as headwear is my kinda cute cartoon animal.
Kurt Busiek on Pokémon
I do not have a Pikachu Patronus, no matter how kickass that would be.
—from the big list of Things I Am Not Allowed To Do At Hogwarts

Pokémon video game series

 
Conclusion: Pokémon are really freaking hax.
Valigarmander on the Fridge Logic that permeates the series in general, particuarly the Pokédex entries.
 
 
My name's Oak! People call me the Pokémon Prof.
Professor Oak, Pokémon Red, Blue and Yellow'
 
 
Hi! I like shorts! They're comfy and easy to wear!
Unnamed Youngster, Pokémon Red, Blue and Yellow (named Regis in Gold and Silver and Ben in FireRed and LeafGreen)
 
 
Heheh! This gym is great! It's full of women!
Unnamed old man, Pokémon Red, Blue and Yellow
 
 
We hope to see you again. [1]
—An extremely callous and insensitive Pokémon Center nurse, Pokémon video game series
 
 
[Pokémon] used [move]. It's super effective!
Pokémon video game series
 
 
Yo! Champ in the making! [2]
The Gym Caretaker, Pokémon video game series
 
 
Strong Pokémon. Weak Pokémon. That is only the selfish perception of people. Truly skilled trainers should try to win with their favorites.
Elite Four Karen, Pokemon Gold and Silver
 
 
I came when I heard you'd beaten the ELITE FOUR.
Professor Oak, Pokemon FireRed and LeafGreen
 
 
 

Pokémon anime series

 

Jessie: Prepare for trouble!
James: And make it double!
Jessie: To protect the world from devastation.
James: To unite all people within our nation.
Jessie: To denounce the evils of truth and love!
James: To extend our reach to the stars above! [3]
Jessie: Jessie!
James: James!
Jessie: Team Rocket, blast off at the speed of light!
James: Surrender now, or prepare to fight. [4]

Meowth: Meowth, that's right!
Team Rocket's motto (1998-2006), Pokémon anime
 
 
The early bird catches the worm, or in this case the Pokémon.
Professor Oak on Ash's oversleeping, Pokémon anime, "Pokémon: I Choose You"
 
 
151 hopes, 151 dreams, 151 memories...
Professor Oak
 
 

The mysterious creatures of this planet
Pocket Monsters...
"Pokémon" for short!
Now, the story of the boy Satoshi and Pokémon,
Their meetings, adventures, and battles

Are about to begin!
Introduction shown at the beginning of the Japanese openings.
 
  1. In all games except for HeartGold and SoulSilver
  2. "Yo! Legend in the making!" in HeartGold and SoulSilver
  3. In very early episodes, both of them said the previous two lines at once
  4. In later episodes this would become "...or prepare to fight, fight, fight!"