Tom's Kangaskhan

Tom's Kangaskhan is part of Tom Simms' Pokèmon roster, and is usually on his team. He had a long-running rivalry with a rogue Rhydon.

Background
Kangaskhan lived in the regional Safari Zone, and had a falling out with his mate, leaving him depressed and unmotivated. When Tom and Porygon found him, they convinced him, with some help from a psychic link provided by Porygon, to join their team.

Tom later was tasked with subduing a rampaging Rhydon in Funsen City, choosing Kangaskhan to deal with him. The ensuing bloody battle ended with Rhydon making a retreat, thus beginning a long rivalry between the two. Whenever Rhydon and Tom would cross paths, another brutal fight between the two would inevitably happen.

After Tom finally caught Rhydon, the two would manage to work together, forming a surprisingly effective team, albeit begrudgingly.

Trivia
But Asylum! You may say, Kangaskhan's a female-only species! Why have you made a male Kangaskhan? Well, dear reader, this was written way back in the year 2000, when GSC had just come out. RBY, you may remember, had no displayed genders, other than the Nidoran family of course. By the time I had found out Kangaskhan was a girls-only club, this and more was already published. So why is there still a male Kangaskhan in the story? Because I'm too lazy to change it. Ahh, honesty!
 * Canonically, there are no male Kangaskhan. Asylum would explain the inclusion of a male Kangashan on his DeviantArt account: