Here are some Pokemon I think would be like the characters in X-men:
Jean Grey/Gardevoir
Wolverine/Zangoose
Storm/Absol
Gambit/Typhlosion
Prof. X/Alakazam
Angel/Pidgeot (Braviary when Archangel)
Iceman/Golduck
Cyclops/Noctowl
Beast/Primeape
Nightcrawler/Houndoom
Magik/Misdreavus (Thanks to Trueform!!! :D)
Colossus/Ursaring
Banshee/Exploud
Shadowcat/Mawile
Rogue/Toxicroack
Jubilee/Skitty
Magneto/Aggron
Sabretooth/Seviper
Apocalypse/Regigiggas
Mystique/Liepard
Husk/Scrafty
Scarlet Witch/Mismagius
Quicksilver/Shiftry
Cannonball/Tauros
If anyone else has ideas of which Pokemon reflect an X-Man, leave a comment!!!