Like all other Gyms in Paldea, the Artazon Gym building itself is simply used for registering Gym challengers. The Gym Test and Gym battle are both conducted at other locations within Artazon.
Gym Test
The Artazon Gym Test is Sunflora Hide-and-Seek, which is initiated at the Sunflora Lawn. The player must find ten Sunflora hiding across Artazon in order to pass. After a Sunflora is found, it will follow the player until the end of the Gym Test. Sometimes, a Sunflora will battle the player upon being found.
These Sunflora cannot be caught; the Bag will not display the Poké Balls pocket and the battle interface will not display the X Button shortcut to use a Poké Ball.
The Artazon Gym appeared in HZ010, where Brassius had temporarily closed it due to him experiencing an artist's slump. After Liko, Roy, and Nemona had gathered lots of Sunflora to the Sunflora Lawn in the hopes of cheering Brassius up, Brassius challenged Roy to an unofficial battle to test if he was worthy of facing the BlackRayquaza. Despite Roy's Fuecoco learning Stomping Tantrum during the match, he was still defeated after Brassius Terastallized his Sudowoodo.
Pokémon used in the Gym
Sudowoodo ↔ Terastallized Sudowoodo
Sudowoodo is Brassius's second known Pokémon. It is capable of Terastalizing into a Grass type. Brassius used it in his battle against Roy and his Fuecoco. Despite Fuecoco learning Stomping Tantrum during the battle, Sudowoodo was still able to defeat it after Terastallizing.