Mallow's Steenee evolved into Tsareena after dealing with Team Rocket during a PokéDance competition. After evolving, it had the strength to face off against Team Rocket. It has the powerful move Trop Kick as well as Sweet Scent at its disposal but its true battle capabilities are unknown.

Mallow found Shaymin on Poni Island after Tapu Fini's mist made her see her departed mother. After the mist cleared, Mallow found Shaymin. She decided to look after Shaymin until it changes form and can fly away. When Mallow's brother returned with some Gracidea flowers, it changed into Sky Forme and flew away with its friends.

Mallow's Bounsweet evolved into Steenee during battle with Team Rocket. Once it had evolved, it was far more capable a battler, with various moves including Magical Leaf and Double Slap at its disposal. In addition to its battle strengths, Steenee still helps Mallow out at the Aina Cafeteria.

Mallow's Bounsweet is often seen outside of its Poké Ball with Mallow in the school. Like her, it's quite energetic. Its battle srengths aren't currently known, but it was able to defend itself from an attack by a wild Rowlet. It often helps Mallow out in the Cafeteria. Despite the lack of attacking seen, it eventually evolved in a battle with Team Rocket. It was originally caught by her mother for her