The park is separated into two main areas. The southern part contains several benches and a patch of flowers. Several people rest in this area, including a Teacher with a Persian that gives a Quick Claw to the player.
The northern part is circular and resembles a Poké Ball, with a fountain in the center, a semi-circular patch of tall grass to the south and another of long grass to the north, the first instance of this type of grass that is encountered in the games. Trainers can be battled only within these patches of grass, though there are no Trainers to battle during a Bug-Catching Contest.
National Park appeared in The Bug Stops Here, where Ash and his friends came by it just in time to see the Bug-Catching Contest starting. Ash and Casey, who also appeared at the site, decided to participate the contest. Casey ended up catching a Weedle that Ash was trying to catch, but eventually Ash caught himself a Beedrill. After dealing with Team Rocket's latest scheme, during which Casey's Chikorita evolved into a Bayleef, Ash was declared the winner of the contest, earning him a Sun Stone and allowing him to keep the Pokémon he had caught. Before the group parted ways with Casey, Ash decided to give Beedrill to Casey, knowing her love of yellow-and-black-striped Pokémon.