From Bulbapedia, the community-driven Pokémon encyclopedia.
Pokémon Hustle (Japanese: ポケモンハッスル Pokémon Hustle) is a game show featured in Beating the Bustle and Hustle!. It seems to be based on a traditional Japanese game show.
Trainers and their Pokémon may become contestants and must complete various challenges such as running across a rolling log and dodging foam boulders.
Both Dawn and James are fans of Pokémon Hustle. Dawn even decided to be a contestant on the show along with Ash and Brock. Team Rocket, however, decided to set up a fake Pokémon Hustle in order to steal Trainers' Pokémon.
It resembles a Japanese Game show known as Sasuke (or Ninja Warrior in America) with its many obstacles.