Oshawott

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Oshawott originally belonged to Professor Juniper, as one of the three starter Pokémon  a new  Pokémon Trainer  could choose. Ash called him cute when he was sent out in  In The Shadow of Zekrom! , when Trip had to decide between the three starters. He then became extremely shocked when Trip chose Snivy. Soon after, he started taking interest in Ash, observing him but staying out of sight, and to the point that he left Professor Juniper's lab to follow him.

Eventually, Oshawott expressed interest in traveling with Ash and convinced Ash to take him along on his journey in  A Sandile Gusher of Change! . Ash only realized that it was Professor Juniper's Oshawott when he failed to capture it in a new Poké Ball, and had to obtain a worried Professor Juniper's approval to allow Oshawott to travel with him and to request for Oshawott's Poké Ball.

Oshawott has a sea-shell shaped appendage on its belly that can be detached and used to battle, and occasionally throwing, as it did in  Enter Iris and Axew!  when he popped Team Rocket 's balloon, thereby saving Pikachu and  Iris's Axew  from captivity. Oshawott's shell is made of keratin, and being light but strong, it is capable of deflecting attacks, prominently shown when he deflected Pansage 's  Bullet Seed  and ultimately  SolarBeam  in  BW006. During that decisive match for the Trio Badge, he subsequently used its shell in a  Razor Shell  attack to defeat  Cilan 's Pansage, earning Ash a victory.

Oshawott was revealed to be male when it battled a wild female Snivy  that would be caught by Ash in  BW007. He became infatuated when hit by Snivy's Attract, and was eventually recalled.

In BW010, he was used to fight against  Trip 's  Hatooboo. He was defeated by two consecutive hits of Aerial Ace, due to Hatooboo's  Super Luck  ability.

In BW015, he battled  Lenora  and her  Watchog  after her  Lillipup 's  Roar  pulled him onto the battlefield, to his surprise. Despite fighting well and making use of his shell as a shield again, he was defeated by a powerful Thunderbolt  after Watchog separated him from his shell. In BW016, Oshawott and  Tepig  trained with Ash in the  Battle Club  to increase their speed. During the training, he learned Aqua Jet, but had trouble with hitting the target. He battled Watchog again in Ash's rematch with Lenora after being pulled into battle again by Roar. He still showed some difficulty in controlling Aqua Jet, but he managed to hit Watchog on his third try. Unfortunately, he also knocked himself out in the process, leaving Tepig to battle Lenora's Herdier  alone.