Sunbo first appeared as a Sunkern in Sunkern Treasure, as one of the many Sunkern running away from an attacking Skarmory. Gold, seeing how well the Seed Pokémon could jump, decided to catch one to help him defeat the Skarmory. He then orders her to jump into the air with Exbo on her head to transport him into the sky. When the two got high enough Exbo used Ember, allowing Falkner to capture it.
In You Ain't Nothin' but a Houndour, Sunbo battled alongside Gold's other Pokémon against the Masked Man. Sunbo fought against his Ariados and used Growth but was quickly knocked away due to Gold not knowing how to handle battling with multiple Pokémon. After retreating and thinking of a new plan Gold had Sunbo attempt a Mega Drain against Ariados. However, Ariados intercepts this attack by firing spiderwebs from its back, proceeding to bind Gold.
In The Last Battle VI, Sunbo fought in Gold's last battle against the Masked Man. During the battle Sunbo evolved into Sunflora and she once again used Sunny Day to boost Exbo's fire attacks, which quickly began to melt the Masked Man's ice and prevent him from regenerating his ice body. In The Last Battle XIV, it was revealed that Sunbo evolved by the rocks in the area reflecting sunlight similar to how a Sun Stone does.
In Out-Odding Oddish, Sunbo participated in the Pokéathlon alongside Sudobo and Togebo. They start with the Jump Course, and are shown competing in Disc Catch competition. Sunbo and Sudobo easily catch a disc that was thrown to them, and Gold points out that most Pokémon would crowd together to catch a single disc, but since Togebo is small, he can easily move through crowds. Togebo pushes his opponents away and easily catches the disc, which signifies the end of the match. The next round they compete in is the Lamp Jump. While Sunbo and Sudobo easily touch some lights, Togebo rudely pushes his opponents out of the way, which gives Gold enough to points to earn the Jump Medal. The same three later competed in the Speed Course and encounter a powerful Trainer, Jet. In the Hurdle Dash and Pennant Capture competitions, Jet's team easily defeats Sunbo and Sudobo. In the final match, Relay Run, while most Trainers are seen running with their Pokémon, Gold is seen simply sliding on the ground slowly while riding on his skateboard in the wrong direction. An exhausted and in last place Sudobo struggles to move on, so he is switched for Sunbo. Seeing there is not much time left, Gold switches Sunbo out for Togebo. Togebo's fast speed allows him to easily catch up to Jet's Dodrio, but he is kicked away into the gravel by Dodrio's foot. The dirt gets into Togebo's eyes, preventing him from being able to see and run properly. Gold commands Togebo to keep going and gives him directions on where to move, having spent his time memorizing the course. Togebo continues running and eventually manages to make it past Jet's Dodrio, which gives Gold the win.
As shown in her debut Sunbo is a serious Pokémon who hates seeing other Pokémon being harmed. She is quick to jump into bad situations and can't stand leaving someone alone when they are in trouble. Sunbo is often paired up with Exbo to use Sunny Day to power up his Fire-type moves. She has a strong relationship with Gold due to being with him for most of his journey.