Well, the Anime is never Accurate. Talking Pokemon Game logic though, they technically evolve in their pokeballs since there isnt a cutscene of Pokemon getting out of their balls and glowing. so the answer is yes
EDIT: For the Anime, NOPE. Anime Logic does not match the games, Proof: This episode, dont remember which. was in bw tho, Juniper & Bianca Traded their Karrablast & Shelmet. when they sent it out, they started to Evolve