Sonic Prime, but only Shadow (and Sonic) fights with Grim Sonic and its duplicates.

Grim Sonic is a formidable opponent, even Shadow, the ultimate lifeform, cannot easily defeat him easily. Here are all the scenes that Shadow (& Sonic) faces Grim Sonic. 00:00 Shadow and Sonic faces Grim Sonic for the first time 01:35 Grim Sonic gets back 01:47 Shadow&defeat 1 02:01 Shadow&return 02:46 Sonic and Shadow VS Grim Sonic&duplicates 1 03:21 Sonic and Shadow VS Grim Sonic&duplicates 2 03:26 Grim Sonic&defeat 1 03:43 You are not going anywhere 03:54 The final round #sonicprime