Something I always wanted to do with Emerald is just jump into the Battle Frontier proper. So far I've had a fun experience with this.
One little pet peeve that bothered me, but I don't really think is bothering anyone else: Why not name Stomping Tantrum to just Tantrum instead of Chrono Trigger menu-style abbrevations? I understand that the much newer move names are long and hard to insert though, I've had a lot of time dealing with that in said menus... 😅
EDIT: Using the latest patch, I ran into a male Glaceon in the Lv. 50 Factory that knows Shadow Ball twice. Also, there appears to be some type of sprite priority bug? When my Simipour uses Focus Blast, sometimes the attack appears under the sprite.
When going to the building with the betting trainers, I seem to have crashed the game. I talked to a hiker who told me to leave him alone, then I talked to the woman to the right and declined to battle. After that I talked with everyone, and I just got a blank with nothing. Everyone would just pause with not even a text box and then leave me alone for a bit, but when I talked to the woman again I crashed the game.