Oshawott was one of the Unova Region's starter Pokemon who was under the care of Professor Juniper. When the new trainer, Trip and Ash Ketchum who had arrived from Kanto witnessed the three Pokemon being shown for the first time, Oshawott made such a good impression that Ash even called it "cute", causing the Water Pokemon to become embarrassed.
Trip eventually chose Snivy which caused Oshawott to become as still as a statue and fall over in shock. Oshawott, however developed an interest in Ash and left Juniper's lab, following the young Trainer from a distance. Oshawott later proved his worth by saving Ash's Pikachu and Iris's Axew from Team Rocket's clutches before fleeing the scene.
Oshawott finally showed himself to Ash and begged for Ash to take him along. Unfortunately, after attempting to capture Oshawott in a Poke Ball and failing, Ash realized that the Oshawott in question was the same one he had seen back at Professor Juniper's lab. Ash contacted Juniper who had become worried over Oshawott's mysterious disappearance and after getting her approval, obtained Oshawott's Poke Ball which gave Oshawott permission to fulfill his dream of travelling with Ash at last but Oshawott had gone missing again. After nearly falling into boiling water while stopping a dam from cracking, Ash saved Oshawott's life by returning the Pokemon to his Poke Ball, resulting in Oshawott becoming Ash's newest addition to his Unova team and also a permanent member of his overall team of Pokemon.
|Water Gun +||Enter Iris and Axew|
|Tackle||Triple Leaders, Team Threats|
|Razor Shell +||Dreams by the Yard Full!|
|Aqua Jet +||Rematch at the Nacrene Gym|
|Hydro Pump +||Expediton to Onix Island!|
|+ indicates this Pokémon used this move recently.*|
- indicates this Pokémon normally can't use this move.
Misato Fukuen (Japanese)
Lisa Ortiz (English)
- Oshawott is the first of all Ash's starters to not be caught after a -type starter was captured (Tepig was second as always with fire types), Ash captured a grass-starter in each region first, then catching the other starters later on.
- Besides Pikachu, Oshawott is the only other starter Ash got from a Professor. Ironically, Oshawott is the Water starter, which is what Ash wanted to start his journey with when he planned to pick Squirtle as his starter.
- Oshawott seems to be over-confident, but at the same time scared of many things.
- Oshawott comes out of its Poké Ball on its own much like Misty's Psyduck, Brock's Croagunk, Jessie's Wobbuffet and May's Skitty.
- Though male, Oshawott's English Dub voice actor is Pokémon voice veteran Lisa Ortiz.
- Oshawott can't fight well without his shell. This is probably because he uses it as a shield. This may also be because of one of his signature moves "Razor Shell", a Water-type move much the same as 'Razor Leaf'.
- He has very similar personality traits to Dawn's Piplup and Ash's Gliscor, as Piplup can be spoiled at times and that Gliscor tries to get Ash's affection a lot and had a fear to overcome.
- Oshawott has a developed crush on Iris's Emolga. Like Dawn's Buneary has a crush on Ash's Pikachu.
- A running gag is when Oshawott is not chosen for battle he becomes a white statue and faints.
- Oshawott's water-related fear is similar to Misty's Psyduck's Hydrophobia when he closed his eyes underwater using Aqua Jet.
- When Oshawott is mad, he throws his scalchop on the ground, picks it up, and place it back on his chest.
- Oshawott was the star of two episodes: Oshawott's Lost Scalchop! and Facing Fear With Eyes Wide Open!
- Oshawott can sometimes be jealous of Ash's and Pikachu's relationship (which is similar to Ash's Bayleef). However, it was only shown in the first few episodes of Pokémon Black and White (In Anime).
- Oshawott seems to be the more romantic member of Ash's team, as he's developed more crushes on any other Pokèmon than anyone else on Ash's teams in the entire Anime.
- He develops a crush on Iris' Emolga (though it is revealed that she likes Iris' Axew when he had a crush on her first), Misha's Purrloin (though it is revealed that it was actually male), Georgia's Vanilluxe (though it only likes Dragon-type Pokemons like Iris' Axew), Dawn's Buneary (though it already had a crush on Ash's Pikachu) and a wild Meloetta (though it seems that Dawn's Piplup also does more that him, causing a clash between the two).
- Oshawott can be really glutinous, sometimes it's enough to make him fat.