Kyle is what one would refer to, in the olden days, as a hero. He legitimately enjoys helping people, for both the satisfaction of a job well done and knowing he made somebody else's life better.
The money or gifts he earns on the occasion for these good deeds are pretty awesome in his opinion as well.

He is also supremely reckless: he'll charge into pokemon battles without so much as a second thought, relying on strength and power to defeat opponents. On more than one occasion, this has resulted in an embarrassing defeat, but he always returns from it stronger than he was before.

He's mostly laid-back, enjoying sleeping, relaxing, and eating every bit as much as he does battling and training. In his mind, if you don't enjoy your journey, what's the point?

History: Kyle moved to Vaniville Town at a young age, about 10, but didn't start adventuring until...well, until much later. He simply lacked the motivation for it. He had no interest in the outside world, and why would he? From what his mother told him, the outside world was a scary and dangerous place, full of marauding Pokemon, controlling gangs, and horrible things besides!
But Kyle always loved Pokemon. Despite not having his own, he would watch pokemon battles on his television, secretly yearning for the ability to do what Trainers did.

The opportunity came, one wintry morning, when Professor Sycamore, renowned Pokemon professor, visited Vaniville Town for a Pokemon Exhibition. Pokemon were given away to prospecting trainers, who also learned how to care for and love their pokemon. Kyle watched from the shadows, waiting for the opportunity to speak to Sycamore. When nobody was looking, he approached the Professor, and asked for a Pokemon of his own.

For a moment, the Professor was confused: the boy seemed a bit old to just be starting his journey. But he recognized the burning love of Pokemon the boy had, deep in his eyes, and decided to make an exception. He brought out the three starters of Kalos: Fennekin, Froakie, and Chespin. Kyle observed each critically, before finally settling on Chespin. He took the young Pokemon back to his home, and there they began. Kyle showered Chespin with love, brushing him, feeding him, and petting him. In the morning, they left for training.

In the nearby Pokemon Center, Kyle purchased several Pokeballs, and began searching for his first Capture. He happened upon a Fletchling, who he proceeded to battle. It was a difficult fight for the Grass-type Chespin, but they soon triumphed, capturing Fletchling.

They journeyed from town-to-town, battling trainers, having fun, and bonding. Over time, Fletchling evolved into Fletchinder, and it was around that time that Kyle heard of the faraway region of Viore. He heard of the exotic nature of the region, and decided that he'd rather adventure there, rather than in Kalos.

He consulted with his mother, who was hesitant to allow him to leave so far from home. But, after seeing his rapidly developing bond with Chespin and Fletchinder, decided that it was time for her little boy to grow up. She provided him with a plane ticket and a some spending money, and saw him off on his journey.

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