It's in the e621 of the artist, but in short, metal sonic stealed the liquid metal from eggman and upgraded himself with it to become more "alive" and live peacefully, but eggman wants it back 'cause it's really powerfull or wathever.
It's in the e621 of the artist, but in short, metal sonic stealed the liquid metal from eggman and upgraded himself with it to become more "alive" and live peacefully, but eggman wants it back 'cause it's really powerfull or wathever.