Well i was lisening to "This is Halloween" From Nightmare before chrismas while playing on my (action replay earned) Darkrai on pokemon platinum. This idea struck me and i couldnt let it pass XD.
Darkrai as Jack
Banette as Sally
Ghost Houndour as Zero

I also fixed the song a little ^_~
Link to original song:
[link]

[Ghastlys]
Boys and girls of every age
Wouldn't you like to see something strange?

[Shuppets and Dusclops]
Come with us and you will see
This, our home of Halloween
This is Halloween, this is Halloween
Pichus scream in the dead of night

[Random Pokemon]
This is Halloween, everybody make a scene
Trick or treat till the trainers gonna die of fright
It's our home, everybody scream
In the home of Halloween

[Gengar]
I am the one hiding under your bed
Teeth ground sharp and eyes glowing red

[Cofagrigus with a Spinarak on head]
I am the one hiding under yours stairs
Fingers like snakes and spiders in my hair

[Random Pokemon]
This is Halloween, this is Halloween
Halloween! Halloween! Halloween! Halloween!

[Driftloons]
In this place we call home
Everyone hail to the nightmare song

[Dusknoir]
In this place, don't we love it now?
Everybody's waiting for the next surprise

[Random Pokemon]
Round that corner, man hiding in the trash can
Something's waiting now to pounce, and how you'll...

[Ariados, Haunter & Muk]
Scream! This is Halloween
Red 'n' black, slimy green

[Haunter]
Aren't you scared?

[Mismagius]
Well, that's just fine
Say it once, say it twice
Take a chance and roll the dice
Ride with the moon in the dead of night

[Spiritomb]
Everybody scream, everbody scream

[Ghastlys]
In our home of Halloween!

[Yamask]
I am the one with the tear-away face
Here in a flash and gone without a trace

[Duskull & Froslass]
I am the "who" when you call, "Who's there?"
I am the wind blowing through your hair

[Drifblim]
I am the shadow on the moon at night
Filling your dreams to the brim with fright

[Random Pokemon]
This is Halloween, this is Halloween
Halloween! Halloween! Halloween! Halloween!
Halloween! Halloween!

[Misdreavus, Shuppet and Ghastly]
Tender lump lings everywhere
Life's no fun without a good scare

[Male and Female Jellicent]
That's our job, but we're not mean
In this home of Halloween

[Random Pokemon]
In this town

[Dusknoir]
Don't we love it now?
Everybody's waiting for the next surprise

[Random pokemon]
Darkrai Jack might catch you in the back
And scream like a Whismur
Make you jump out of your skin
This is Halloween, everyone scream
Wont' ya please make way for a very special guy

Our man Jack is King of the shadow patch
Everyone hail to the Nightmare King

[Every pokemon]
This is Halloween, this is Halloween
Halloween! Halloween! Halloween! Halloween!

[Misdreavus, Shuppet and Ghastly]
In this place we call home
Everyone hail to the nightmare song

[EVERYONE]
La la-la la, la la la lala[Repeat]

[I do not own Pokemon or Nightmare before chrismas or its songs.]