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Mettaton Undertale was created by a royal scientist. He is the best host in the entire Underground and that is why everyone loves him. He hosts a lot of shows and can be called the face of the entertainment industry. Therefore, he is the one of the most popular there.
During the adventure, you are capable of encountering him in the laboratory. Then he is going to begin to reveal the details of the life of a scientist, and then you can even fight him. Thus, you can even witness his completely different form!