Arceus

Ash was dreaming when Arceus appeared in his dream saying "As a gift for your help in saving the world multiple times and to make your dream come true I will give you the ability to change reality to your desire by just saying what you want and as soon as you do it will happen".

Ash's eyes widened in the dream as he stared at Arceus in a mix of awe and disbelievement. He rubbed his eyes, wondering if this was just another lucid dream, but Arceus's majestic presence only grew more vivid. The Creator Pokémon's voice boomed in his mind, its words etching themselves into Ash's subconscious. He felt a strange energy coursing through his veins, as if the very fabric of reality was being rewoven to accommodate this newfound power.

As the dream began to feel more real than ever, Ash's excitement got the better of him. He thought about all the possibilities, all the wonders he could create with a mere thought.

"You can use it both for evil and good it's your decision"Arceus said as he unleashed a blinding Light which enveloped Ash which caused him to wake up.

As the light dissipated, Ash found himself sitting up in bed, gasping for air as if he had been underwater for too long. His heart racing, he looked around his Pallet Town bedroom, trying to shake off the vividness of the dream. But it didn't feel like just a dream. The words of Arceus still echoed in his mind, and he could swear he felt a strange, tingling sensation in his fingertips. He rubbed his eyes again, trying to clear the haze, but the sensation only grew stronger.

Ash's gaze fell upon the Pokémon posters on his wall, and suddenly, his mind was flooded with possibilities.