The announcer, Rhonda, reports there is a contest where Pokemon dress and act as another Pokemon. She shows a Chatot singing like a Jigglypuff and a Trapinch dressed as a Turtwig. The winner of the contest gets an Pokemon egg. The judges are Nurse Joy, Officer Jenny and Mr. Sukizo. Dawn, Brock and Ash are watching this contest as audience. Dawn tells Ash the contest is always popluar and many people watch it.
Team Rocket are dressed as cowboys. Jessie tells Rhonda (via the camera) she is bound to win, but is surprised to hear only Pokemon can enter. So, James will register Mime Jr. and Jessie Meowth. Ash runs and Dawn and Brock follow. Ash wants to compete, as it sounds fun and the egg as a reward is neat, so Brock and Dawn join as well. Brock is *very* interested, as girls like men with an egg. Dawn stops them, as they need to pick one of the Pokemon to represent. Ash sees his Pokemon and has a hard time thinking what they could be. Pikachu wants to enter... as he is experienced! Dawn chooses Piplup and Brock his Croagunk.
After some more-or-less successful representations, it is Brock's turn. He dressed his Croagunk as Polietoed. With this, Croagunk passes. Next are Jessie and Meowth, who is dressed as a Weavile. The crowd love this disguise, but Jessie convinces it can do so much more. Meowth imitates some other Pokemon and passes to next stage. Next are James and Mime Jr. James places a hat on Mime Jr. to imitate Claydol and (later) Chikorita. James and Mime Jr. also pass to the next round.
The last year finalist, a Chatot, sings as a Jigglypuff. Foortunately enough, nobody is asleep and passes. Dawn and Piplup, dressed as Weedle, come. Everyone is fascinated by the costume. Sadly, Piplup got excited and uses Bubblebeam, a move Weedle cannot use, so the judges do not allow them to pass. Next are Ash and Pikachu. Pikachu changes its shape to some Pokemon, like Loudred, Seviper or Lotad. The judges allow them to pass as well. With all the Pokemon represented, Rhonda will announce the winner soon enough.
Jessie sees the competition and tells Meowth to do what he knows best – impersonating a Sunflora. Meowth thinks the boss would be happy with the egg, but Jessie stops him there, as they do not know which Pokemon rests inside – maybe even someone very powerful. The finalists are about to take their last action. Dawn is sad, but cheers her Piplup, as there is always next year. While Chatot sings its song, Meowth proposes to steal the egg while nobody is looking. Jessie points at somewhere to distract everyone and snatches the egg, then draggs James away. However, Croagunk saw this and alerts Brock.
Brock accuses Team Rocket (in disguise) to have taken the egg. They run away, but Jenny sends Growlithe to stop their way. Team Rocket take their disguises away, though James knows this was a bad idea. Jessie sends Seviper, who uses Haze to dim the vision. Ash sends Staravia, who uses Gust to blow the smoke away. Team Rocket made it to the balloon and go away. Ash goes to order Pikachu to use Thunderbolt, but Brock reminds him this could damage the egg. Instead, Staravia uses Wing Attack to cut the balloon, but Dustox's Poison Sting makes it harder to reach. Piuplup uses Bubblebeam on Dustox, but Mime Jr.'s Mimic copies the move and collides with it. James ir proud of Mime Jr., but Jessie thinks she saw better. James is insulted and Mime Jr. uses Teeter Dance to confuse them. Jessie is enraged, as it only affects their Pokemon, not the twerps. Meowth accidentally pushes the egg and it falls, so Dawn sends Piplup, who jumps and gets the egg. Since the egg is safe, Pikachu uses Thunderbolt to blast Team Rocket off. The egg is retrieved and the judges the declare the winner – it is Brock and Croagunk! Brock receives the egg and Rhonda closes the reportage and gets beaten by the microphone.