Pokémon : S5 | E57 – A Claim to Flame!

Ash leaves the Silver Town Pokémon Center, having just registered for the upcoming Silver Conference. He and his friends are greeted by Gary, who announces that he is also entering the tournament. Ash remarks that he is going to do well and Gary retorts that he will set the record straight this time around before walking off. Despite Gary's overwhelming confidence, Ash is determined to prove himself.

Later, Brock guides his friends to the Athlete's Village. While looking around, Ash notices Mr. Goodshow, president of the Pokémon League, handing out balloons to children. Meanwhile, at a nearby restaurant, Team Rocket is having trouble serving dishes to hungry diners. Jessie eventually snaps when a young girl addresses her as "old" and asks where her hamburger meal is. Believing that "the customer is no longer right", Jessie promptly eats all of the food about to be served, and her teammates soon join in. The manager stumbles upon the trio and promptly fires them.
(Source: Bulbapedia)