Assuming you'd like to write about the actual Pokémon episode, which is likely "Watch Pokémon" (Season 1, Episode 19), here's some information to get you started:

In this episode, Ash and his friends are on a mission to watch a Pokémon exhibition match between two Gym Leaders, but things don't go as planned. The match is interrupted by a group of poachers who try to steal the Pokémon.