Timeline: Between Sonic Forces and the Neo Metal Sonic Saga.
Rouge was snooping through an abandoned laboratory, trying to find some good loot. But sadly, to no avail.
Rouge: "Jeez, you'd think an abandoned lab has something worth finding..."
She then kicked something out of frustrated disappointment, only for a stack of papers to fall before one of them caught her attention. It was a complete file on something called "Project Solvex".
Rouge: "'Project Solvex', hmm..? Now you got a woman curious...~"
She read through the file completely. Basically, an anonymous scientist created a bio-genetic being made from the DNA of the five strongest heroes of Mobius at this time, which is Sonic, Shadow, Silver, Blaze, and Knuckles. The scientist said that Solvex will be the being’s given name and that they hope Solvex won't be used for evil.
Rouge: "Well, mystery scientist, Solvex will be in good hands with us...~"
She threw the file aside and managed to lift the capsule containing Solvex before flying to Tails' workshop.
Later, at Tails' workshop.
Sonic, Tails, Knuckles, Amy, Shadow, snd Cream were all surrounding the capsule while Rouge explained everything.
Rouge: "And that's basically everything..."
Tails nodded while scratching his chin.
Tails: "Well, you did a good thing bringing it to us, who knows what Eggman would've done with Solvex if he found them..."
Knuckles did an agreeing grunt while Shadow simply rolled his eyes. Sonic, however, was more giddy than anything.
Sonic: "Who cares about Egghead right now? We got some cool bio-dude joining the squad, I can't wait to teach them some of my moves!"
Shadow scoffed.
Shadow: "Please, the last thing we need is another Sonic."
Sonic just grinned.
Sonic: "Oh, come on, Shad, you're acting like you ain't gonna teach them your moves too!"
Amy then got into the conversation.
Amy: "Regardless of who's teaching them, we have to make sure not to overwhelm them when we open the capsule, alright..?"
Sonic and Shadow nodded and scoffed with an eyeroll respectively before Amy gave a satisfied nod and turning to Cream.
Amy: "Alright, Cream, you can open the capsule now."
Cream nodded eagerly as she grabbed the top.
Cream: "I hope Solvex is nice!"
She then gently opens the lid and drops it to the side, finally revealing Solvex to everyone.