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Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
New World Saga
Hearing reports of energy spikes in Silver Valley, Amy Rose, Chris and Tails came to the valley hoping to find a Chaos Emerald. As the trio settled with a picnic when they did not find any Emerald, E-47 Pumpty appeared and trapped them. Eggman then arrived in his Egg Mobile, explaining he staged the news reeports so he could lure the trio to the valley and hold them hostage in case his plan to eliminate Sonic by manipulating Knuckles into fighting him failed.
Having received Knuckles' challenge, Sonic met with him in Silver Valley and they began brawling. During the fight, Sonic noticed Chris, Tails and Amy when the trio made Pumpty explode while trying to escape it. Putting his fight with Knuckles on hold, Sonic fought Pumpty, only for Knuckles to interrupt. As Eggman then tried holding Sonic's friend hostage in Pumpty for a Chaos Emerald, Knuckles realized he had been tricked, and so helped defeat Eggman and Pumpty while Sonic saved his friends. In the aftermath, Knuckles left Sonic on good terms.