Here's why:
* Older game mechanics: Pokemon Shiny Gold is a fan-made ROM hack based on Pokemon Gold, which was released in 1999. At the time, the technology didn't allow for complex features like voice chat.
* Game design: The focus of Pokemon games is on exploring, battling, and catching Pokemon. The story and interaction with other characters are mainly through dialogue and limited cutscenes.
If you're looking for a Pokemon game with more interaction and communication features, you might want to try newer games like Pokemon Sword and Shield, which have features like online battles and trading.