You are now Water and Fighting!

[Boilurn]

Cofagrigus is Ghost/Steel because its coffin is made of pure Gold. (As mentioned on the White Pokedex Entry)

 

[roosterman]

steelix is now a steel flying type because he flys. next is X good luck doing that without the X legendary.

 

[Bounce]

Xatu is now purely Flying type because that's the only Pokemon that starts with X and I cannot think of anything else.

 

[ShadowMirror]

Unknow is now a Dark pokemon because it has a such a eery backstory, and is very unknow

 

[Serperion]

Gastly is now Pure Ghost-type because well it is just pure spirit
Haunter and Gengar are now Ghost/Psychic because of Levitation and Hypnosis related movepools

 

[mishy.]

^ follow the rules. Gastly does not start with 'N' (nor does Haunter and Gengar). Gonna go from Gastly though to keep the flow of the game.

Yamask can become Ghost/Psychic due to Power Split and Guard Split why not.

 

[Aryan143]

Klinklang is now Steel/Electric because it learns a lot of Electric moves and probably it uses Electromagnet to float in the air.

 

[ShadowMirror]

Girafarig is now a grass type, because giraffes eat leaves from the tallest trees

 

[Squirrel]

Gengar is now Ghost & Dark because his evil nature and mischievous trickery suit Dark type much more than Poison.

 

[ShadowMirror]

Rayquazza is now Dragon/Fire because it sounds cool

 

[Seth Rollins]

Axew is now a ground and bug type because he looks like larvitar and his last evolution, haxorus looks like a bug!

 

[akshat4444]

Wartortle is now a rock water type because come on, a shell !!

 

[lineofdeath]

Empoleon is now water ice because he is a penguin and where do penguins live?

 

[Xilfer]

In Antarctica! ...Oh, right, rhetorical.

Ninjask should be a Bug/Ninja Dark type because that would be an awesome typing, plus Ninjas generally tend to stay in the shadows, ya know?

 

[lineofdeath]

Kingler is now rock and water. It looks rocky.

 

[EnglishMilkshake]

Charizard is now Rock type because it is number 6.

Nevermind, Charizard should be a Dragon type. It has wings but it can't learn fly! And it looks like a Dragon! Why is it not Dragon-type?

Hahaha, a "You are number 6" joke...

 

[lineofdeath]

Didn't follow rules, but

Darkrai is now dark psycic.

 

[mishy.]

Illumise can now be a Bug/Flying type. ♥

 

[EnglishMilkshake]

Electrode is now Ground/Steel, "Ele" reminds me of Elephant, and it's a metal ball

Eek! 2 E's E-----e

 

[lineofdeath]

Excadrill is now groiung and dark. It looks so evil