A high-quality anime illustration in a wide wallpaper format, featuring a medium shot of a single Blue Pokeball floating centrally above a serene underwater seascape. The Pokeball is rendered with a polished, metallic sheen, reflecting the caustic light patterns from the water's surface above. It is surrounded by a flurry of tiny, luminous bubbles and drifting sea particles that dance in the current. The background is a breathtaking deep-sea environment, with undulating coral reefs in soft teals and purples, swaying sea anemones, and distant schools of small, shimmering fish swimming through shafts of ethereal sunlight piercing through the crystalline blue water. The atmosphere is tranquil and immersive, characterized by a monochromatic blue color palette with vibrant turquoise accents, soft depth of field, and a luminous, aqueous glow that permeates the entire scene.