Metal Sonic's ultimate objective is not merely to defeat Sonic, but to surpass him in every conceivable way—to prove himself as the one true Sonic. Through repeated observation and analysis, he has determined that Amy's unwavering affection for Sonic is one of the few variables he cannot overcome through speed, strength, or combat alone. To Metal Sonic's logical processors, the solution is simple: if Amy loves Sonic, then becoming superior to Sonic in every aspect should logically reciprocate those feelings toward her.