The next day

Serena: I dressed up as Nurse Joy

Gary: Im a Pokemon Professor

Drew: Im Luigi

May: Im Mario

Clemont: Im an Ampherous (thats how you spell it, right)

Misty: Im in my Vampire hunting uniform!

Dawn: Im a zombie!

Paul: Im a werewolf! Hey, wheres Ash?

Ash arrives

Ash: Im a vampire! (Not a costume, lol)

Later that night
???: prepare to DIE!