Bounsweet is a Pokémon with strong affinity, as she likes to use Sweet Scent to make her friends happy. She is also quite optimistic, as she doesn't feel sad even when Lillie is afraid of her.
Lillie watched over Bounsweet, Popplio and Togedemaru, while Mallow, Lana and Sophcles were riding three Tauros representively. Later, Bounsweet was with Mallow, who showed Ash the Pokémon School. Bounsweet emitted a scent to Pikachu, making him feel relaxed.
The next day, when Lillie gave Mallow a new recipe for Pokémon food, Bounsweet jumped in happiness. This startled Lillie, who was still afraid to touch Pokémon.
Bounsweet was with her trainer, who went with Ash to see what new Pokémon he would catch in the forest. Bounsweet also watched as Team Rocket appeared, who threatened to steal all their Pokémon, and how they were dragged by a Bewear. Since Pikachu was injured in a fight against a wild Grubbin, Mallow and Ash took him to a Pokémon Center. The next day, as Mallow and Ash were having a meal, Bounsweet emitted a scent, which relieved Ash, Mallow and Pikachu. Suddenly, a Rowlet was flying and sensed Bounsweet's scent. Mistaking it to be a berry, Rowlet went to grab Bounsweet, who repelled the attack, then Mallow told Ash that she caught Bounsweet at the forest behind the mountains of the school. Once Rowlet recovered, it grabbed off a watermelon and went to the Pikipek nest. There, Mallow and Bounsweet watched as Ash battled Team Rocket, and how Rowlet joined Ash.
Bounsweet went with her trainer to fishing and watched as Ash and Lana were rescuing the Pokémon Team Rocket stole. Bounsweet was with her trainer when Ash explained the "Litten situation". The class spoke about the Rattata and Raticate problem and found out the solution were Yungoos and Gumshoos. Their yelling startled Togedemaru, who ran in circles and knocked Popplio and Bounsweet off the table. Pikachu managed to stop and calm her down, but Togedemaru started showing affection towards him. Bounsweet, along with her trainer, was at the party to celebrate Ash and his Pokémon's Grand Trial of Melemele Island victory.
Mallow and Bounsweet spent a day on the beach with Mallow's classmates. Bounsweet spinned in the water for Mallow and Lillie's amusement, which soaked Ash and Sophocles. Mallow was training with her Bounsweet for the Pokémon Pancake Race. The next day, the two participated in the race. However, in the third part of the race, Bounsweet accidentally bumped into Mimikyu. This caused Mimikyu to fire Shadow Ball on Lana's Popplio's bubble and pierced it (the attack was meant for Ash's Pikachu). This caused Bounsweet, Mimikyu and Popplio to be eliminated. The next day, Bounsweet watched as Lillie's egg hatched into a white Vulpix and Samson Oak's egg into red Vulpix. While the white one, Shiron, ignored the group, the red one wanted to play with the others. After the school was over, Bounsweet and Ash followed Mallow, who wanted to see how Lillie was doing with her Shiron. The next day, after Lillie befriended Shiron and hugged it, Shiron was more interested in playing with the class's Pokémon.
None of Bounsweet's moves are known.