I wouldn't change much beyond stopping making characters as one-dimensional and trying to keep things more authentic to the games. The anime is good as is. It's very popular and does its job of selling the games well.
It's basically unpopular with people here, who are all older than the target audience. It's like watching a kid show and then deciding that it needs to be retooled so adults will like it.
It's bad as a kids show and it's just bad in general. I can still watch regular kids shows and enjoy them. I can't enjoy this even though it's pokemon.
It really says something when you can't enjoy a show based on something you love.
I never cared about justice, and I don't recall ever calling myself a hero. I have always only fought for the people I believe in. ~Zero
The horrible formulaic episodes are why it (was) so bad. I don't know if they still do it since I haven't watched it in ages, but man that got old fast.
-ash and co. meet some random filler character and their random new pokemon -ash and co. decide to help them with their random problem -team rocket shows up and tries to capture pikachu (seriously, why pikachu? who would want it?) -team rocket gets rekt -they all lived happily ever after
And speaking of ash, that guy has to get killed off. He's just a terrible in every way.