After defeating Gary in the E4, he doesn't say too much. I miss how he has a sob story about losing. I suggest putting in more conversation after defeating Gary

So right now all Gary says after losing is something like "oh shoot I lost"

Here is a paraphrased transcript of what Gary could say:

Pre-battle

Hey player,

I was looking forward to seeing you, my rival should be strong to keep me sharp.

While working on my Pokedex, I looked all over for Pokemon.

Not only that, I assembled teams that would beat any Pokemon type.

And now, I am the Pokemon league champion.

Player, do you know what that means?

I'll tell you.

It means I am the strongest trainer in the world.

 

Post-battle

No! That can't be! You beat me at my best! After all that work to be a champion and my reign is over already? It's not fair!