Before The Shadows Fade
This is the English dubbed version of "Nyaasu no Party." The dubb killed the song, so they say, but nevertheless it's cute.
On a side note Nyaasu's lines are written the way his dubbed voice talks [as close as I could come to it]. Here are some you might have trouble with: a-da=of the, an’=and, ta=to, tinkin'=thinking, t'row=throw, neva=never, pahty=party, poifect=perfect, dey're=they're, yea'=year, hea'=here, fea'=fear, fohr=for, dere's=there's.

[Meowth:] Bumblin' an’ fumblin'.
Screwin' up and stumblin'!
Looks like Team Rocket's blastin' off again.
We're always stinkin'!
It got me ta tinkin'!
And now Meowth has got da poifect plan.

I'll t'row a pahty!
Admission will be free!
It would be a snap when they walk right in my trap!
Its neva been such fun, stealin' lots of Pokémon.
Humans ain't invited cuz I said so!
Once dey hit da dance floor DAT’S when dey're done for!
Dis is one scheme even WE can't blow!

[Jessie & James:] Meowth, Meowth, Meowth, the party is so exciting.
[Meowth:] It's gona be da biggest bash a-da yea'!!
[Jessie & James:] Meowth, Meowth, Meowth, won't you tell us who you're inviting?
[Meowth:] Everyone who's anyone is gona be hea'!!
[Jessie & James:] Meowth, Meowth, Meowth, aww, this party's not for fighting?
[Meowth:] Ice cream for everyone; dere's nothin’ to fea'.

Go cat, go.

Mrrm, mrrm.

[Jessie & James:] At Meowth's party blast off at the speed of light!
[Meowth:] Fohr one night only no Pokémon is lonely.
[Jessie & James:] At Meowth's party Team Rocket's not gona fight!
[Meowth:] So move your feet to da sound a-da beat.
[Jessie & James:] At Meowth's party DON'T tell the boss, not tonight.
[Meowth:] I wish dis pahty could go on foreva.