No, because sticking with the storyline, Shadow has yet to be awakened on Space Colony Ark.
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Shadow and Knuckles are both the strongest Sonic characters.
no, but you can unlock knuckles, amy, and cream.
You can play Sonic 3, or Sonic & Knuckles but unfortunately you cant play Sonic 3 & Knuckles on Sonic's Ultimate Genesis Collection.
All fan couples: Sonic & Amy (Even though in Sonic X, its considered Canon. {actual Couple}) Tails & Amy Knuckles & Amy Shadow & Amy Tails & Cream Tails & Cosmo (Also Canon in Sonic X) Knuckles & Rouge Knuckles & Tikal Knuckles & Cosmo Shadow & Rouge Shadow & Maria Shadow & Molly Silver & Blaze Silver & Amy That's all i can think of right now.... Hopefully this helped.
You can't The only characters you can get are Sonic, Taills, Knuckles, Cream, Amy, and Shadow