Where can you watch Sonic vs Shadow?
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When Professor Gerald was working on the Ultimate Life form project, he and his reaserchers called the task Project: Shadow because of the sarcasm involved as you cannot create a Shadow since it was something that never existed. But in Sonic X Japanese version, Maria states that Shadows purpose in his creation was to protect and watch over the people like a "Shadow". But Sonic X isn't canon.
In a story Amy told sonic to come back but when Sonic said no he stared to hang out with Sally then Shadow asked Amy whats wrong then Shadow gave her some promises but when Sonic saw Shadow and Amy Sonic wanted Amy back to him so Sonic and Shadow were battling each other but sonic crashed into Amy then Shadow got mad so Shadow took Amy to the doctor and now Sonic and Sally…