The best? ME! That's hard for me to pick... There was a lot of good Pokemon in the game.

Magikarp is the worst

do you mean as in evil

if so its darkrai and why does the first guy who answered have a badge and ive seen him
every where in the hints,cheats,etc.

cuz he wants to ruin the world but dusknoir if u beat the special mission he saves grovyle
and helps him fight primal dialga

Sorry I was in a rush when I posted this question(school morning,you understand).

Yes, I do mean who is the most evil in the game.

its Darkrai cuz he tried to destroy da world and he made u lose ur memory and all that (:

Darkrai, duh! Dusknoir's bad but Darkrai's pure evil. He's so hung up over this whole
"world trapped in nightmares," which is just plain crazy!

Why would Darkrai want to ruin the world?
That's one thing I don't understand.

DARKRAI IS BEST AT EVIL.HE WANTS TO DESTROY THE WORLD!DUSKONOR IS JUST A SPY.THEN
AGAIN,DUSKONOR TRIED TO KILL GROVLES SPIRIT TO USE THE EMPTY BODY.THATS PRETTY BAD.BUT
DARKRAI'S BEST AT EVIL.

What is his motivation!
Why dose he want to destroy the world!
Someone please answer my question!

It's an opinion question. There IS no right or wrong.