What happens if sonic gets all the chaos diamonds?

If Sonic collects all the Chaos Emeralds, he gains the ability to transform into Super Sonic, a more powerful version of himself with enhanced speed, strength, and invulnerability. This transformation allows him to combat formidable foes and overcome significant challenges. Additionally, the Chaos Emeralds can be used to restore balance and peace, often thwarting the plans of his arch-nemesis, Dr. Eggman. Ultimately, collecting all the Chaos Emeralds elevates Sonic's abilities and helps protect his world from chaos.