Talcon

Talcon is a Lycanroc who's strive to be accepted led him to befriend a group of shady Pokemon. He took part in a heist set up by them, their target, a local museum in the Alola region. The night they showed up, one by one they turned out dead from an unknown threat lurking within the museum. Talcon ended up tripping over one of their bodies and smashing his head into the glass case, of course he was unharmed, but this did trigger the alarm. Panicked, he attempted to flee the scene, of course, not empty-handed, he went for what he assumed was the biggest treasure; a strange coffin in a glass case. Busting into it, he grabs the coffin, only to reveal it was a Cofagrigus all along! It swung open, grabbed him with it's arms, and forced him inside the coffin.

Day finally broke, after the police had investigated the crime scene, none survived, except, for Talcon. All night he was kept inside the Cofagrigus, and by the time he was freed, it was too late, his mind had been corrupted, he was no more than a mindless servant to this thing, forced to do it's bidding of eliminating the thing it fears most, Dark Types. Eventually, as time progressed, the Cofagrigus became more greedy, and it got to the point he did more than just mind control him, he now possessed the body of Talcon. Now the Cofagrigus spirit inhabits the body of Talcon as the 'new host,' and in this time, one is unsure how but he came into possession of dark magic, be it previous knowledge or simply learning from scratch. His purpose still has not changed, his goal is to eliminate any Dark Types in his way, and the Guardians as well, due to their attempts to stop him.