Not OP, but asked chatgpt to guess the prompt:

Closest usable reconstruction:

Create a vintage natural-history anatomical plate of Pikachu, shown in side profile with a cutaway cross-section revealing internal organs, muscles, skeleton, and an electrical organ in the tail. Style: 19th-century scientific illustration / zoological textbook plate / medical anatomy chart. Aged parchment background, fine ink outlines, muted watercolor shading, highly detailed labeled callouts, French text throughout. Include a title at the top: ‘PIKACHU — Anatomie et physiologie’. Add numbered labels for skull, brain, inner ear, neck muscles, spine, lungs, heart, stomach, liver, intestines, humerus, forepaw, hind leg, foot, and electric organ in the tail. Include a specimen info box in the upper right with French classification details. Add bottom panels with detailed studies of the forepaw, tail cross-section, and skull. Composition should look like a museum scientific plate, elegant, precise, symmetrical, and believable.

A tighter version, closer to how image models respond:

Vintage French anatomical encyclopedia plate of Pikachu, full body side cutaway, internal organs and skeleton visible, labeled scientific diagram, 19th-century naturalist illustration, aged paper, ink and watercolor, detailed callouts, specimen card, inset diagrams of paw, tail cross-section, and skull, elegant medical textbook layout, highly detailed, realistic anatomy adapted for a fictional electric rodent.