What misconceptions about the games did the anime give you in the past?

I remember an early episode where Ash and co. were saying that they preferred evolving pokemon by leveling them up instead of using stones, so that led me to believe that all pokemon evolved with experience, but you could force them to evolve with stones. I remember having a race with my brother leveling up our pikachus and I told him "no cheating by using the Thunder Stone".

Another one is in the Lt. Surge episode, where Lt. Surge's Raichu was slow because he evolved it too early, so I thought that when you evolved a pokemon affects its stats. That one stayed with me at least until Gen 2. Back then I tried to evolve my Seadra as early as possible because I thought it would end up stronger with more experience as a Kingdra.