Spike

Spike is a the first Pokemon to be own by Matthew in his journey throughout the Alola Region in Ultra Paths.

As a wild Pokemon
Aipom first appeared in Alola to Alola!. A Thunderstorm caused by Tapu-Koko, caused Spike to pass out and get injured. Matthew ended up finding Spike on the ground and rushed him to Professor Kukui's laboratory to get him some help. In The Pokedex Challenge!, Aipom ends up recovering and Matthew ended up getting the okay by Professor Kukui to capture Spike by giving him a Love Ball in which he did, after he noticed the bond between the two. After being caught Matthew gave Aipom the nickname Spike as it matched Aipom's spiky hair.

With Matthew
In Rival Rustle!, Spike helped Matthew catch a Noibat. Then after Matthew was challenged to a battle by Ross, Spike ended up battling Ross's Litten. The battle was fierce but Spike lost the battle, but at the same time formed a new rivalry with Ross's Litten.

Personality and characteristics
Spike acts as the mature and responsible one to Matthew's immaturity, casing a great balance between the two. But sometimes Spike is shown to enjoy laughing and pulling pranks on people. Spike is usually seen outside of her Pokeball and likes to rest on Matthew's shoulder.

Trivia

 * Spike is the first Pokemon in the story to be kept in a Love Ball.