Ash Ketchum first encountered Mijumaru at
Professor Juniper laboratory as it was one of the Pokémon that
Trip was to choose from.
Ash Ketchum called it cute when he first saw it which caused Mijumaru to blush a bit. After being shocked that it wasn't chosen by
Trip, it followed
Ash Ketchum and
Ash's Pikachu as they started their journey in the Isshu region.
It rescued
Ash's Pikachu and
Iris' Axew from Rocket Gang.
Ash Ketchum thanked it but quickly left it behind in the forest so that he could treat
Ash's Pikachu. It continued following
Ash Ketchum until one day it met up again and tried to explain that it wanted to join
Ash Ketchum on his journey.
Ash Ketchum tried to capture it with one of his Poké balls but then realized it already had a Poké ball and that this Mijumaru must have been the same one that he met at
Professor Juniper lab. He contacted
Professor Juniper and she agreed to let him have the Mijumaru and transferred its Poké ball to him. By the time it had been transferred over, it had disappeared again.
Ash Ketchum met up with Mijumaru once again when they were resting in the sands at
Dan's hotel. After protecting
Ash Ketchum from being scalded from a hot water geyser,
Ash Ketchum quickly recalled it into the Poké ball before it got scalded itself. Since then
Ash's Oshawott has had the tendency to come out of its Poké ball whenever it feels like despite what the current situation is.
Gym Battles against Lenora's Watchog
During the first gym battle against
Ash's Oshawott,
Lenora's Watchog used
Mean Look so
Ash's Oshawott couldn't be switched out. Since
Ash's Oshawott wasn't expecting to battle
Lenora's Watchog at that time, it was at a disadvantage and it was in a bad mood. After
Ash's Oshawott lost its shell during the battle,
Lenora's Watchog was able to use its
Thunderbolt effectively to knock
Ash's Oshawott out of the match.
During the rematch battle against
Lenora's Watchog,
Ash's Oshawott had learned
Aqua Jet during the time between the two battle and but its accuracy make it easy for
Lenora's Watchog to avoid it. Though through sheer luck,
Ash's Oshawott Aqua Jet managed to hit
Lenora's Watchog and both ended up getting knocked out at the same time as
Lenora's Watchog used
Thunderbolt just before it got hit.
Three-on-Three Battle Against Trip's Timburr
Ash's Oshawott was paired up against
Trip's Timburr but the beginning of the battle didn't go to well for
Ash Ketchum as
Ash's Oshawott had its eyes closed during
Aqua Jet and completely missed hitting
Trip's Timburr. After a short break in the battle, the two finished up with their final attacks.
Ash's Oshawott's
Razor Shell proved to be stronger than
Trip's Timburr's
DynamicPunch and
Ash's Oshawott defeated
Trip's Timburr despite its initial problems with
Aqua Jet's accuracy.
Mastering Aqua Jet
While training in
Don George's pool for the battle against
Lenora,
Ash's Oshawott learned
Aqua Jet. It's aim proved to be quite off but through sheer luck it was able to use
Aqua Jet to knock out both
Lenora's Watchog and
Stephan's Blitzle. It wasn't until
Trip noticed by taking some pictures during his three-on-three battle with
Ash Ketchum that
Ash's Oshawott had its eyes closed during
Aqua Jet.
Ash Ketchum vowed to help his Oshawott practice to keep its eyes open underwater so that its
Aqua Jet's targeting would be accurate.
While enroute to Raimon City,
Ash Ketchum,
Iris and
Cilan's Pokémon all got poisoned and the only thing that could cure them was a waterweed plant found in a nearby lake.
Ash's Oshawott was training with
Ash Ketchum at the time and didn't get poisoned and since it was a Water Pokémon, it was best suited for the job. Unfortunately
Ash's Oshawott still didn't like to open its eyes underwater until it was forced to defend itself against a school of Tympole who were protecting their lake from trespassers.
Ash's Oshawott opened its eyes underwater to defend itself and it started to get comfortable doing so.
Ash's Oshawott was later forced to battle Palpitoad because it came out of the water to protect its lake. During the battle,
Ash's Oshawott managed to master its
Aqua Jet as it was able to remember the battle against the Tympole school and how having its eyes opened underwater was quite effective and that proved to be the decisive factor in the battle as Palpitoad was knocked out and
Ash Ketchum caught it.
Battle against Bel's Father's Hihidaruma
Ash Ketchum challenged
Bianca's Father to a Pokémon battle to allow
Bianca to continue to travel. He agreed but changed the challenge to force
Ash Ketchum to return home to Pallet Town if he lost the battle.
Ash's Oshawott came out of its ball as it wanted to battle against
Bianca's Father's Darmanitan and
Ash Ketchum thought that it would be okay because it had a type advantage being a water Pokémon. Even though
Bianca's Father's Darmanitan only used Fire type moves throughout the battle, it proved to be too strong for
Ash's Oshawott.
Ash's Oshawott did manage to land an
Aqua Jet.
Bianca's Father commented though that his Red Flash Hihidaruma gets more fired up the more resistance it faces and shortly after it knocked
Ash's Oshawott out. Despite loosing the battle,
Bianca's Father changed his mind because the battle with
Ash Ketchum and his Mijumaru made him remember the joy of traveling.
Battle Against Pod's Baoppu
Initially,
Ash Ketchum was going to battle
Chili's Pansear with his
Ash's Pikachu, but
Ash's Oshawott popped out and wanted to battle it instead.
Ash Ketchum agreed and despite the type disadvantage in this battle,
Chili just got more fired up.
Chili's Pansear managed to cover its weakness with power and momentum and taking
Cilan's advice into account, it used
Flame Charge to increase its speed to become useful when dodging
Ash's Oshawott moves.
Chili's Pansear managed to endure
Ash's Oshawott super effective moves just long enough for it to use its newly learned
SolarBeam attack which
Ash's Oshawott was unable to dodge and it was knocked out.
Chili's Pansear won the battle despite the type disadvantage.
Battle Against Clay's Krokorok
Clay's Krokorok was the first Pokémon
Clay used to battle against
Ash Ketchum during his gym battle.
Clay's Krokorok was paired up against
Ash's Oshawott as
Ash's Pikachu initially wanted to battle it but
Ash Ketchum realized that an Electric type against a Ground type would be a bad idea.
At the beginning of the battle,
Clay's Krokorok had the upper hand as its
Sandstorm managed to get sand in
Ash's Oshawott's eyes and it also made it harder for
Ash's Oshawott to accurately attack.
Clay's Krokorok managed to hit
Ash's Oshawott with a
Bite and a
Stone Edge attack but it wasn't enough to knock it out.
Ash's Oshawott used
Water Gun to clear up the
Sandstorm and then it began its counterattack.
Clay's Krokorok was repetitively hit with multiple attacks from
Ash's Oshawott including a super effective
Aqua Jet and
Razor Shell combo that ended up being too much for it and it was knocked out.
Battle Against Clay's Palpitoad
Ash Ketchum decided to keep his Oshawott out to battle against
Clay's Palpitoad and right away it became evident that
Clay's Palpitoad was the stronger Pokémon as its
Hydro Pump ended up being more powerful than
Ash's Oshawott Water Gun.
Clay's Palpitoad followed up with a
Sludge Bomb that knocked
Ash's Oshawott's scallsword out of its hand and just as it was retrieving it, it got hit by
Clay's Palpitoad Rock Smash's and was knocked out.
Ash's Oshawott and
Dawn's Piplup both fell in love with
Meloetta and the two of them began a rivalry to win the affection of
Meloetta.
Ash's Oshawott would often come out of its PokéBall when it could tell that
Dawn's Piplup was trying to take advantage of a situation. Even though the two of them often argued, they found a common ground and became friends after
Meloetta left.
Scallsword King Playoffs Tournament
Ash's Oshawott participated in the Scallsword King Playoffs tournament on Hotachi Island. It defeated
Cadbury's Dewott in the final round of the tournament and became king. Realizing that she wouldn't be with
Cadbury's Dewott,
Osharina jumped off the stage to be with him. This caused
Ash's Oshawott Scallsword to break and according to the rules of the tournament, it was stripped of the title of king and
Cadbury's Dewott became the king.
Ash's Oshawott bandaged up its Scallsword and
Cilan noted that it would heal pretty quickly.