Pokémon : S5 | E46 – Why? Wynaut!

Ash and his friends enjoy a hearty breakfast with Clair from her Blackthorn City balcony. Attention quickly turns to Ash's Badges. Clair informs him that the Silver Conference will take place in three months in Silver Town, and she recommends that he should register at New Bark Town. Ash stands from his seat in excitement and declares that he is headed to New Bark Town. Team Rocket has plans of their own, and they decide to steal Ash's Badges for their own purposes; Meowth and James want to sell the Badges, while Jessie plans to enter the Silver Conference using them. In the midst of their discussion, Team Rocket's food is stolen, with Wobbuffet receiving the blame.

Jessie and James pose as a reporter and cameraman just as Ash and his friends are walking out of the Gym gates. Jessie takes Ash's jacket and hands it to a hidden Meowth, whilst James puts Ash in an oversized red coat and a golden crown. Ash poses for several photos, as Meowth and Wobbuffet admire Ash's Badges. Jessie returns Ash's jacket and begins to walk away with James. However, Ash utters the word "prepared", causing Jessie and James to try and resist the urge to say their motto. Ash mentions the word "trouble" next, and Team Rocket instinctively reveals their true identities. Meowth and James tell Ash that they have come for his Badges. Ash peers inside his coat, noticing that the eight Badges have been replaced with bottle caps.
(Source: Bulbapedia)