The Gym was created by Ramos from the plants he had collected, and contains a giant central tree, on which a vine-based obstacle course has been built, which includes climbing up and down the vines, as well as swinging on them to get from one platform to another. Once the player has ascended to the top of the obstacle course, Ramos may be challenged. After he is defeated, a gate will open next to him, having a slide back to the bottom.
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The Gym appeared again in Under the Pledging Tree!, where it was called the Pledging Tree (Japanese: 誓いの樹Vow Tree). According to a legend, a Trainer and his Pokémon, who had traveled far and wide before eventually settling down to the future location of Coumarine City, had planted the tree long time ago. Once a year, people of the city hold a festival under the tree, where Trainers give presents to their Pokémon to celebrate their bonds with them.
Jumpluff was also the first Pokémon that Ramos used during his Gym battle with Ash, sending it out to face Ash's Fletchinder. Even though it was able to boost its Defense and Speed to withstand and avoid Fletchinder's attacks, the Ember Pokémon managed to boost its own Speed with Flame Charge so that it was finally able to reach Jumpluff and defeat it.
Weepinbell was the second Pokémon that Ramos used during the Gym battle with Ash. Despite being at a type disadvantage, it managed to defeat both Ash's Fletchinder and Hawlucha, partially thanks to the poison inflicted on them by its Poison Powder. However, it eventually fell to an Aerial Ace attack from Ash's Frogadier.
Gogoat was also the last Pokémon that Ramos used during Ash's Coumarine Gym battle, sending it out to face Ash's Frogadier. During the battle, Gogoat demonstrated its strong Grass-type attacks, which were almost enough to defeat Frogadier, until Ash recalled a lesson that Ramos had taught him about gardening, and used it to come up with a winning strategy, allowing Frogadier to eventually defeat Gogoat with a Water Pulse.