No
Because Nintendo and SEGA are competing companies, it is assumed that Mario and Sonic should fight each other.
No! He is the brother of BANANA SONIC who helped Mario defeat Bowser.
Its so obvious! Mario will leave Sonic lying on the ground,groaning.(Mario wins).
No weapons: Sonic speeds around Mario at 600 mph and smashes into him with spin dash, effectively cutting Mario in half. Sonic wins. Weapons: Mario uses a star to go invincible, Sonic uses the Chaos Emeralds to go super. Tie.
If you are referring to Super Smash Bros Brawl, then Sonic could KO Mario in a fight, sure.
In a fight? No. Sonic would spin dash Mario's head off before he had time to blink, let alone use a mushroom or star. In popularity? Polls are usually split 50/50, so it would be a tie. Mario is way better than Sonic. That's why the Mario series is in the lead and always will be.
To me, Sonic is so powerful that all sonic needs to defeat him is to touch him. But again, this is an opinion, this is up to you.
Defeat the circuts in all modes.
after you defeat Sir Gawin, and after a challenge
Sonic would win the fight, but sora would put in one hell of a fight.
Sonic the Hedgehog he has super speed and stuff Mario doesnt do anything except jump on turtles.
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. IT SAYS A FIGHT BETWEEN MARIO AND SONIC, NOT MARIO AND SHADOW.