Superglue's poem/What-am-I riddle-thingies

Just a few things that I've created. If you know what they're about, you can answer the poems. But there are way more to come.

Dragon Quest Monsters: Joker

One is green, the other red
And though I've a nail through my head
I manage to not drop dead.
(unanswered)

---

I'm a bug, but I'm not plain
I run as fast as a speeding train
How do you endure my striking sight
While others away from me refrain?
(unanswered)

----

With scales of golden, eyes of black
Two huge, blue wings upon my back
And a pitchfork that could get a Great Drack'.
(unanswered)

Pokemon

One is speedy, the other slow
One's attack is high, the other's low
One is a dull blue, the other a purple glow.
(very easy, yet unanswered)
Hint: They are counterparts, which is why they are in the same poem.

----

The blue sky endlessly calls me.
The drag of walking endlessly stalls me.
And I would've died, but the strength of my head endlessly appalls me.
(unanswered)

Pokemon:

I don't know blue, but is the purple Mewtwo?

No.

HINT:

They are counterparts, which is why they are in the same poem.

New riddle added for Pokemon.

2 pokemon:

Ummm? Squirtle?

No. counterparts. It means that...

Well, check here. A Squirtle has no counterpart. You know, like Volbeat to Illumise, Miltank to Tauros.... etc. Two Pokemon that were created to match.

Counter Part One - Palkia & Dialgia?

(Dialga Branchy ^^)

(I am supposed to be logged in like this)

I know the answers, and those are not correct. Sorry :)

They are purple and blue, not pink and blue.

Plus, both Pokemon's base Attack are the same (and high, at that: 120 out of 255). Maybe you should know a little bit more about base stats before guessing ;)

Try this site if you want to look up base stats