Nice job, I really like the story as well as the plot :D
But you should reaaly check out the hero's overworld back sprite. I think there is something wrong with the green part. It is way too big, despite the fact that it looks way smaller in the left/right direction sprite, like my attachment (sr because I can't post URLs)
And I suggest you should make a new sprite for the Normal Gym Leader :D
I know this is not a topic to ask, but how could you fix the PokemonFollowing error? When the Pokemon says "...hates travelling with...", an error pops. So could you show me the following script which you put in? Btw what did you put in common event TalkToPokemon?