Before the story starts, I just want you to remember, this is a fan-based story, with no evidence. It is just to add a little to this Pokémon.
(Sorry for my horrible grammer)
"It happened one morning - a boy with extrasensory powers awoke in bed and transformed into a Kadabra".
(Pekédex; FireRed)
Its been a year. Kody, was again awake at night. He couldn't sleep because of his thoughts. Its benn a year since he started his mission to find all the legendary Pokémons.
He was feeling confused. Just like his Gyarados. He just lost the chance to show all his friends how strong he became in the last year. And like that, in this exact thought, he fell to sleep. Next morning was strange. He felt a little dizzy when he walked around, and noticed that his Pokémons were doing better in the battles. Just when he was about to get away from the tall grass in one of the routes, he had an extreme headache. It lasted for about three minutes, and then it gone better.
The next week was even weirder. He became an extreme trainer, but felt more dizzy every minute pasts. Days after that, items started shaking around him. Three days after, he awoke at night with extreme pain. He started shouting and running, trying to stop the horror. When his old brother entered the room to help, Kody wasn't himself anymore. With telekinetic power, he moved furniture with his mind, and shouted in million voices, "GO AWAY!"
Suddenly, his brother shouted to the opened door, out of the house, and never seen again.
Every day pasts, Kody looked a bit different.
His whole body had a transformation.
He knew what was going on, he knew everything. One day, he freaked out. He ran around all city destroying everything nearby.
He blasted off the city, and and made it to a lonely cave, away from everything. In his last moments of thoughts, he was sorry.
He lived the rest of his life in the same cave, training and using his telekinetic power, to become stronger. He spread the "Kadabra virus" among other strong people with the potential of telekinesis, in order to spread and live. People called them, The Kadabras.