Which Pokémon is the odd one out

It's a trick question all of them are odd ones out in their own ways can you name the ways though?

Will we get an answer?

Turtwig because it's the only one in this pic who's eyes were closed while smiling.

Pikachu because it's the only Pokemon not from Sinnoh
Cherim because it's flying

I don't know, better choose Pikachu.

Cherim cuz it FLIES

I Say Cherrim, Cause No Main Character had a Cherrim and Ash Had Turtwig In Gen 4, Clemont Had Shinx in Gen 6, and Pikachu is with Ash STILL, But that's My Guess

Pikachu. Cherim's O.K. I like Turtwig, Shinx is amazing. I hate Pikachu with every burning inch of my heart.