- You may be looking for the Five Years of Peace from the Light Mobius universe.
The Great Peace was a time period on Anti Mobius that began roughly ten years ago and was an era of peace and prosperity across the planet. Among those who embraced the Great Peace were Jules Hedgehog, who became so wrapped up in it that he barely had time for his son, Sonic.
However, years of peace brought about stagnation, and eventually those in charge were ousted from power by Anti Sonic and his band of Freedom Fighters. (StH: #192, SSS: #10)