No. Shadow is not invinceable. This is a common misconception. Shadow is ageless, not invinceible or immortal. He can die just as easily as the rest of the Sonic gang or by any other means.
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No weapons: Shadow uses Chaos Control to slow down time for Mario, making it incredibly easy to kill him with a Chaos Blast. Shadow wins.Weapons: Mario uses a Star to go invincible, Shadow uses the Chaos Emeralds to go super. Tie.If they were in a boxing ring, Mario would win because he throws MUCH stronger punches than Shadow. Mario can also take a lot of hits before falling.
The duration of Invincible Knights Errant is 2700.0 seconds.
You can't be invincible, but with the right armor and items you can get pretty close. You just need to try combinations. Being invincible would just be cheating though.
Nothing, It is invincible.
Not being able to lose, so you are the best.