Here's why this message appears and what you can do about it:
* It's a "placeholder" for future content: The creator of Shiny Gold likely intended to expand the League Reception Center later but never got around to it. This placeholder message is just a reminder that the area is incomplete.
* It's not a bug: The message doesn't prevent you from playing or progressing through the game. It's simply an unfinished area that will likely remain as it is.
What you can do:
1. Ignore it: The message doesn't affect gameplay, so you can safely ignore it.
2. Explore other areas: There are plenty of other areas to explore and things to do in Shiny Gold.
3. Check for updates: If you're playing a ROM hack, it's always good to check for updates. The creator may have released an updated version of Shiny Gold that fixes or addresses the message.
4. Download a patched version: There might be patched versions of Shiny Gold available online that remove this message or complete the League Reception Center.
Remember: Always be cautious when downloading ROMs or modifications from unofficial sources. Make sure to download from reputable websites to avoid potential viruses or malware.
If you're interested in finding out more about Shiny Gold or other ROM hacks, there are many online communities dedicated to Pokemon ROM hacking where you can discuss these issues with other players.