(Flashback time!)
10 years ago... Berry Forest, Kin Island.
A Hypno was prowling, awaiting for any children to wander in and get lost. However it was night, and no parents would ever let their children near the forest. A different approach was required.
Joe, aged 6, was sitting in his bed in the sleepy town of Three Island. Having been born on Kin Island, his parents have always told tales of the Hypnos in Berry Forest, that bad children that do not go to bed early, will be met by a Hypno, and taken away. Feeling up for a dare, Joe decided to stay up this particular night, to see a Hypno for himself, and even left the window by his bed open.
9pm... 10pm... Joe had been awake for 1 hour, and still no Hypno. Feeling lied to, Joe pulled up his blanket, covered himself up, and went to sleep, night light still on. He started to dream... Of his first Pokemon he will pick when he turns 10... To go on a Pokemon journey... To feel the burden on one's shoulders... Wait. Burden? Even when half-asleep, Joe could feel something on top of him. His blanket was still pulled over his head, but Joe could feel something pulling on it. Awake now, Joe was trembling... Someone... Or something was in his room... And it didn't take long for the reveal. When the blanket was finally pulled away, Joe could see a large figure on top of him. It was pale-ish yellow in colour... And he could also see a puff of fur... Coarse fur... In a dirty-white colour. And then, a face appeared before him, with eyes that seemed stare forever.
Joe screamed at the top of his lungs, and Flailed his arms madly. One such Flail Scratched the creature right under its large nose, causing it to Screech in pain, and escape out of the opened window. Joe's mum soon rushed into the room, and desparately tried to calm Joe down.
... Back in the Berry Forest, a Hypno was running towards a lake. It washed its face in the water, only to Screech in pain. Upon seeing his reflection on the water surface, there was a wound shaped like a wide smile right under its nose...
Time fast-forwards to right after Mewtwo's trial 3 years ago.
Dr. Wily II had all his Pokemon confiscated at the courtroom, and was about to be apprehended when Giovanni stepped in and whisked him away before the Vermilion Police could do anything. With the mainland lost, Giovanni, along with devoted followers, and Dr. Wily II, retreated to the Rocket Warehouse on Chrono Island. Although abandoned, and having a small population of Gastlys, Haunters and Gengars, it was the perfect place to regroup and restrategize. The Grunts caught the Gastlys and Haunters, while Dr. Wily II caught a Gengar. With manpower sort of back, funds was required, and nothing like the black market sale of rare Berries to do its thing. Dispatching Grunts to Kin Island, they raided the Berry Forest for all its rare Berries. On one particular trip, Dr. Wily II chanced upon a Hypno, that was feeding on a young Grunt in plain sight. The Hypno had a distinctive scar under his nose... And the way it fed on the Grunt... Pure malice and disregard... Dr. Wily II must have it...
Fast forward to before the Mind Powder-ing of Fallarbor Town.
Hypno had been under Dr. Wily II for almost 3 years... But the years were filled with erratic behaviour... Behaviour that not even Malamar's or Beheeyem's mental suggestions can corrected. From what the good doctor can deduce from Beheeyem's mind scan of Hypno, the Hypno seemed to have been traumatized by an event about 10 years ago, with regards to a boy... A familiar boy. Thinking the Mind Powder might finally allow him to control Hypno, Dr. Wily II had instructed a Flora spy to sneak Hypno into the populace. Which proved to be overly successful when the spy became food for Hypno.
The Mind Powder is released on schedule, blanketing the whole town. As the townspeople slowly sneezed into zombie-ism, the Hypno choked, and seemingly fainted from the Powder. Once the dust settled, the Hypno slowly woke up... But something was different. Its eyes remained clear... Although they look even more deranged... The scar under his nose became even more pronounced, as if pulsing... And smirking. It was no longer a Hypno... It evolved... Into Hypnoker...
Present time.
Hypnoker had since left Fallarbor Town, and into the ash-covered Route 113. It found a Secret Base in one of the big-trunked trees, and fed on the Bug Catcher inside. Once done, he laid inside and waited... Only one thing on his mind... To feast... On Joe...
"Little kids... Want to play? Follow me... You'll want to stay..."
(WOW. This is REALLY long.)