Envision a menacing dark Pokémon Blastoise, an enormous monstrous turtle unleashing a torrent of water with unrelenting power. Its shell, wet and foreboding, twists with macabre patterns and intricate details, creating an aura of horror. The scene is brought to life with dramatic, cinematic lighting that enhances every feature, capturing the hyperrealism and photorealistic quality of this formidable creature in stunning 8k resolution, set within a tall, immersive 9:16 aspect ratio.