20 poems/song by 20 characters:
Ash: Imposter's weak, Imposter's meek, and if you listen closely you can here him squeak.
Misty: Imposter's weird, Imposter's queer, and he shall keep sucking on his fake beard.
Brock: Imposter'll die, Imposter'll fry, when he goes to the place with the devil guy.
James: Imposter's a lard, Imposter's hard, and it sucks, the Imposter Oaks's card.
Jessie: Imposter's an idiot, Imposter won't fridget, and I'll be glad when I get rid of it.
Cassidy: Imposter's sly, Imposter can cry, and I can't care less if he did die.
Butch: Imposter's deaf, Imposter was left, and Imposter can't play a treble clef.
Giovanni: Imposter's a baby, Imposter has rabies, and who shall care if he's in the navy.
Lt. Surge: Imposter's unkind, Imposter's a rind, and I think that he should get a mind.
Erika: Imposter's stupid, Imposter's rubid, and I doubt if he every met the cupid.
Koga: Imposter ain't funny, Imposter's nose is runny, and in Halloween he dresses like the easter bunny.
Sabrina: Imposter's strife, Imposter's a wife, and I think that he should get a life.
Blaine: Imposter's mean, Imposter's lean, and I think that he has lost his spleen.
Gary: Imposter's not tall, Imposter shall fall, and he keeps banging his head on the wall.
Prof. Oak: Imposter's a joke, Imposter's a bloke, and anyone who likes him is a Slowpoke.
Nurse Joy: Imposter's a mess, none of the less, and I think that he wants to kill all the rest.
Officer Jenny: Imposter's wept, Imposter has left, and I think I'll arrest him for theft.
Pikachu: Imposter's has fled, Imposter's turnin red, and if he's reading this he has a hole in his head.
Meowth: Imposter's no writer, Imposter's can't go higher, on the wanted list that I stire.
Sultan of Insult: Imposter sucks, Imposter ducks, and that's because he stinks more than a Muk.
That's all, folks! And if Imposter's reading this, hope he wets his pants!
Ash: Imposter's weak, Imposter's meek, and if you listen closely you can here him squeak.
Misty: Imposter's weird, Imposter's queer, and he shall keep sucking on his fake beard.
Brock: Imposter'll die, Imposter'll fry, when he goes to the place with the devil guy.
James: Imposter's a lard, Imposter's hard, and it sucks, the Imposter Oaks's card.
Jessie: Imposter's an idiot, Imposter won't fridget, and I'll be glad when I get rid of it.
Cassidy: Imposter's sly, Imposter can cry, and I can't care less if he did die.
Butch: Imposter's deaf, Imposter was left, and Imposter can't play a treble clef.
Giovanni: Imposter's a baby, Imposter has rabies, and who shall care if he's in the navy.
Lt. Surge: Imposter's unkind, Imposter's a rind, and I think that he should get a mind.
Erika: Imposter's stupid, Imposter's rubid, and I doubt if he every met the cupid.
Koga: Imposter ain't funny, Imposter's nose is runny, and in Halloween he dresses like the easter bunny.
Sabrina: Imposter's strife, Imposter's a wife, and I think that he should get a life.
Blaine: Imposter's mean, Imposter's lean, and I think that he has lost his spleen.
Gary: Imposter's not tall, Imposter shall fall, and he keeps banging his head on the wall.
Prof. Oak: Imposter's a joke, Imposter's a bloke, and anyone who likes him is a Slowpoke.
Nurse Joy: Imposter's a mess, none of the less, and I think that he wants to kill all the rest.
Officer Jenny: Imposter's wept, Imposter has left, and I think I'll arrest him for theft.
Pikachu: Imposter's has fled, Imposter's turnin red, and if he's reading this he has a hole in his head.
Meowth: Imposter's no writer, Imposter's can't go higher, on the wanted list that I stire.
Sultan of Insult: Imposter sucks, Imposter ducks, and that's because he stinks more than a Muk.
That's all, folks! And if Imposter's reading this, hope he wets his pants!