Because this is an "Exclusive," you must apply two patches in order:
Features pop-culture cameos, new Gym Leaders, and a new Champion. 🛠️ Step 1: Finding the ROM Hack
However, several highly-rated "Ruby" based hacks with modern features exist that match your likely search criteria for a "completed exclusive" experience: Top Rated "Ruby" ROM Hacks Pokemon Ruby++ (v2.0)
Fan-made Pokémon projects are typically hosted on dedicated community hubs rather than official storefronts. You can search for the "completed" version on these platforms:
⚠️ Please remember that this specific modification is exclusively intended for mature audiences due to its uncensored graphical assets and explicit text. Pokemon Pigment Ruby ROM - Nintendo GBA - romsfun.com