In First Catch in Alola, Ketchum-Style!, Bounsweet was attacked by a wildRowlet, who was attracted to her scent and mistook her for a fruit. Bounsweet quickly responded to the attack, deflecting the Rowlet multiple times with ease before it tired out.
As a Steenee
In A Seasoned Search!, Bounsweet helped Ash and Mallow lure in and subsequently follow a wild Oricorio to the Melemele Meadow, so that they could collect the Nectar necessary for the food Mallow was trying to perfect. However, soon after finding the meadow, they were attacked by Team Rocket, who tried to steal the Nectar for themselves. In order to save everyone, Bounsweet attacked Team Rocket and proceeded to evolve into Steenee. This allowed it to recover the stolen Nectar, free Ash and Mallow, and defeat Team Rocket.
In When Regions Collide!, Steenee was used in a battle against Misty's Psyduck alongside Lana's Popplio. Steenee started the battle with Magical Leaf while Popplio quickly followed with Bubble Beam. Psyduck then counterattacked with Water Gun. Popplio then created a water balloon, absorbing the Water Gun, which it then launched at the Duck Pokémon, trapping it inside. Misty commanded Psyduck to use Confusion, but Psyduck didn't respond. Steenee then attacked with another Magical Leaf, breaking the balloon and causing Psyduck land on its head, giving it a headache. This allowed Psyduck to successfully use Confusion, but before it could do anything more to its opponents, Misty told Psyduck to put Popplio and Steenee down, saying that they had had enough.
In Rescuing the Unwilling!, Steenee was among those used to fight Lusamine's Mismagius, Milotic, and Lilligant, which were under Nihilego's control, to allow Ash to save Lusamine. Going up against Milotic, Steenee countered its attack with Double Slap. Lilligant then made her dance with Teeter Dance, but Ash's Litten and Rowlet released her from the dance, joining the fight. In the next episode, Steenee emitted her own Sweet Scent to lure Rowlet back to her. She then launched Rowlet into the air with her Double Slap, and asked Mallow to throw her up as well. Steenee kicked Rowlet back towards the ground, and, combined with Rowlet's high-speed Peck attack, they used a move Lana dubbed "Rowlaunch" on Lilligant. The attack angered Lilligant, causing it to charge up its Solar Beam attack, but Litten interrupted the move with Fire Fang. Although Lilligant appeared to have been defeated by this move, Nihilego made it get back up and continue battling. The battle ended when Ash and Pikachu performed 10,000,000 Volt Thunderbolt to defeat Nihilego.
In All They Want to Do is Dance Dance!, in preparation for the PokéDance class set up by Professor Kukui, Steenee was taught a dance called the "Alola Hula" by Anela's Oricorio. When the day of the dance class finally came, Steenee stepped away from the others to do some last-minute practice. Due to this, she failed to notice how all of the humans and the rest of the Pokémon present stepped into what turned out to be a pair of cage traps set up by Team Rocket. Noticing that Steenee was still free, Team Rocket fired a net at her, binding her arms and sepals. When Meowth accidentally revealed that the cages have a weak point at the top, Mallow told Steenee to attack it. With her sepals and hands binded by the net, Steenee had to resort to using her feet in order to attack the weak point. While doing this, Steenee unexpectedly learned Stomp, which immediately triggered her evolution into Tsareena. After evolving, Tsareena demonstrated her increased leg strength by using Trop Kick on Meowth and breaking the cages open with ease. After Team Rocket had been carried away by Bewear, Mallow happily greeted her newly evolved partner, who proceeded to perform a new, enhanced version of "Rowlauch" with Rowlet.
Tsareena is a friendly Pokémon, happily interacting with people and Pokémon. She is not easily discouraged, staying positive even after Lillie was frightened by her attempts to play with her. She has a strong relationship with her Trainer. As a Bounsweet, she was normally seen resting on Mallow's shoulder. Tsareena also likes to help Mallow out at her family's restaurant, serving food to customers as the restaurant's poster Pokémon. In the events before SM117, Tsareena even volunteered to stay behind with Abe to help in the kitchen while Mallow took Shaymin to go sightseeing overnight in Malie City with her classmates. In addition, she loves flowers, as shown in The Ol' Raise and Switch. According to Mallow, she likes floral-patterned Poké Beans. In That's Some Spicy Island Research!, Tsareena was shown to like the taste of Poni Island daikon.
Tsareena is a very agile Pokémon. As a Bounsweet, she often used her quick reflexes to deflect Rowlet as it flew toward her. However, after evolving for the first time, she started displaying this trait much less often, due to no longer needing to worry about being consumed by other Pokémon. After evolving again, Tsareena also gained great kicking strength, as well as a more proud and mature personality, although she still remains friendly and respectful towards Mallow.
Tsareena also enjoys relaxing, like in I Choose Paradise!, where, whilst most of the Pokémon were playing in the pool, it laid on a sun lounger at the Pokémon Paradise Resort. In Memories in the Mist!, Mallow mentioned during a flashback that she saw her Tsareena, which was Bounsweet at the time, as her little sister. In turn, Tsareena appears to care for Shaymin like a big sister, as mentioned by Mallow in a flashback in SM117.
Description: Rowlaunch (Japanese: ひっさつのモクシュートCertain-kill Mokushoot) After luring Ash's Rowlet in with Sweet Scent, Steenee or Tsareena knocks Rowlet into the air with Double Slap. Mallow then throws Steenee into the air or Tsareena jumps up, allowing her to kick Rowlet, sending it flying into the opponent at high speeds while using Peck.
The move's Japanese name is a reference to that of Catastropika.
A Japanese event distributed an in-game representation of Mallow's Steenee, along with Kiawe's Turtonator and Lillie's Alolan Vulpix via serial code and local wireless. The serial codes were available at Æon stores in Japan from June 17 to 25, 2017, and could be used until July 4, 2017. The local wireless were available at Pokémon Center stores and Pokémon Stores in Japan from July 22 to August 13, 2017.
The same Steenee was distributed to players who inserted the common serial code ALOLASTEW762 from September 19 to October 31, 2017. The serial code was revealed on September 19, 2017 during the debut of brand new episodes on Animax at 6 pm, on Daekyo Kids TV at 7 pm, and on KBS Kids at 6:45 pm. The serial code was revealed again on September 26, 2017 on Animax.