Blue Moon

John's Oshawott (Jon's Mijumaru), nicknamed Blue Moon, is the first Pokemon obtained by John for his journeys through Unova. Blue Moon was a gift to John from Professor Juniper sent to him shortly before he began his journey in the Unova region. Blue Moon is extremely clingy and loves the spotlight, though he is very unconfident and loses many battles because of this. But with extensive training, he becomes pretty powerful.

History
Blue Moon isn't a good battler at first, his lack of confidence is obvious, though he is very attached and affectionate toward his trainer, John. As time goes on, John's Oshawott grows to be more powerful and confident.

Trivia

 * Oshawott is nicknamed 'Blue Moon' for his fondness of blue moon ice cream, a fondness that Oshawott shares with his trainer.