No, Movie Sonic could not beat Detective Pikachu. Sonic is a hedgehog with super speed, but Detective Pikachu is a Pokémon with a variety of powers and abilities. Pikachu has access to electric attacks, which Sonic would be vulnerable to, and Pikachu also has access to a variety of other attacks that Sonic would not be able to defend against.
Even If Sonic Did Just Have Speed (Which He Doesn’t) That Still Could Be Enough To SpeedBlitz Pikachu. Sonic Runs So Fast The Time Is Basically Frozen To Him And Just By Running Around He Created A Shockwave So Powerful It Didn’t Only Knock Out The Entirety Of Earth’s Power It Also Went Across Space. And Even If That Wouldn’t Be Enough He Always Has Super Sonic Which In This Universe, Doesn’t Have A Time Limit Plus Super Sonic Is Invincible To Most Attacks Meaning Pikachu Would Be Dead
