Board Thread:General Discussion/@comment-1031724-20160901000706/@comment-1031724-20160904235416

Sonic 4 Episode II is set long before Generations, before Adventure even. It even shows Metal Sonic being revived from his defeat in Sonic CD.

And you don't seem to get that I still agree that Eggman could always build another Metal Sonic. Metal Sonic is the third Sonic robot after all (first two being Silver Sonic and Mecha Sonic, whom Sonic and Knuckles respectively destroyed), and he used electricity to revive him when he was defeated in CD as mentioned above, his body was still intact

And Mystic Monkey has very good points