I have a lot of ideas so I made headlines.
Female protagonist with a battle oriented goal
I would have liked to see a tournament arc for Misty and Iris that was similar to the Grand Festival. I think the concept of a Grand Festival in itself is nice but it would also be nice to see something similar but for a girl that battles. Mabye in Sword and Shield this will finally happen? With the focus on gyms and tournaments in the games it would be a missed opportunity otherwise.
I would also like to see a movie that focuses on the female protagonist again. The only one I can think of is the Manaphy movie but Haruka was still a damsel in distress at the end.
Silver/Paul
I would also like to see some game plots adapted into the anime. I think Silver (and the plot with his father) should have replaced Paul. While Paul is my favorite rival, he had a weak backstory and motivation. In the concept art you can even see Silver in place of Paul! What does this mean? It would have been good advertisement for HGSS too. His personality would mostly be the same I think.
Emma in the anime
I would also like to see Emma adapted into the anime in place of Shauna since she has a little more depth. It would be interesting to see a homeless girl become the Kalos Queen.
Emma could also have been involved in the Team Flare plot with Alain, which would also give Serena something to do since she ended up in the background while the other companions Clemont and Bonnie played important roles. It would also give Serena an interesting relationship outside of Satoshi which might make her more likeable to non-shippers?
BW1 game storyline adapted into the anime
I would also like to see the storylines from BW1 and SM adapted faithfully. I'm not sure if Satoshi should be the one to fight N though.
Mabye Hilda/Touko could have been like Alain and had an arc dedicated to her before meeting Satoshi and becoming his rival? Then Team Plasma attacks the league like in the games and she awakens the dragon. Mabye Iris helps her awaken the dragon which would also be a good way to showcase her development as a dragon master?
Sun and Moon game storyline adapted into the anime
I would also like to see SM's plot adapted. I would ditch the school and have a traveling aspect. The trial captains keep their roles from the games. The group would be smaller consisting of three people: Lillie, the female protagonist from the SM games and Satoshi.
Female protagonist would have a battle related goal involving tournaments while Satoshi has to complete all the trials. Female protagonist is the one who supports Lillie emotionally when they fight mommy dearest (who is more like her game counterpart) and shows a wide range of emotions (unlike her game counterpart
).