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You used trainerbattle 0x0. You need to change it to 0x9(not sure if its the right value, I haven't been hacking for a long time) if you want the script to continue after battle.
That means you messed up the code which loads tilesets and tilemaps of the maps. You need to undowhat you have made. If you are good at asm you can track the code. Maybe just pointers messed up.
You can add seasonal Pokémon. Just use DNS and these tutorial will help:
https://www.pokecommunity.com/threads/348944 , https://www.pokecommunity.com/threads/299436
Me and some some of my close friends started watch the anime series all over again (because it has been illegal to put it on tv and nintendo stopped the sales of their consoles in my country since 2000s). And some day one of my friends found the Pokemon have games and we all started tto playing...
I found 2 options for you:
1. If you know asm, you can search the difference between normal and the first rival battle and figure it out.
2. Use sethealingplace in level scripts. Make a script that uses special 0x0 and use
...
setflag 0xX
trainerbattle @after
...
#org @after
setflag 0xY
...
XSE and Pokescript are the most common used script editors. A script editor have a basic programming language that is only for gba roms. Don't wory it is not like C or Java. If you want to learn how to write scripts, there are good tutorials about it. Like...
In my hack you play in the Anatol region(which is Anatolia which is where Turkey is located) so I use the name of the cities with translation and changing the letter's places. Like Diyarbakır=Diyar+bakır=land+copper=land+cu=Culand
Get A-Map to insert scripts to OWs.
Get XSE to write scripts to OWs.
Get A-Trainer or Hopeless Trainer Editor yo change trainers.
I don't recomend to use G3T for Pokemons. But it's perfect for adding and changing moves. So you can get PGE, G3HS, YAPE. For the changing sprites I recomend...