In the game "Undertale", who was Mettaton's creator?

In the game Undertale, Alphys is revealed to be Mettaton's creator. As the royal scientist, Alphys builds Mettaton as an entertainment robot with the intention of using him as a television star to boost the popularity of monsters. However, she later upgrades him to his EX and NEO forms, transforming him into a formidable opponent in the game's battles. Mettaton's creation by Alphys adds an intriguing layer to the game's storyline, highlighting her role as a scientific genius and showcasing the complexities of artificial intelligence within the world of Undertale.