I am not sure if this was brought up before or exists because I am fairly new to this game but, I thought it might be an easy way to find shops and trading threads by finding keywords such as pokemon name, item name, etc. for example: lets say you are looking for an albino bidoof, you could open a "keywords" tab and then search any shops or trading threads mentioning that specific pokemon or item kinda like ctrl + f but except it searches for mentions of said pokemon in threads

This would be considered a search function and has been rejected multiple times. Here is the full post as to why the Forum Search Function has been rejected. Also, we do have a wiki page of the Summary of Rejected Suggestions which we try to keep up with as much as possible and it might be helpful in case you want to know if it has been rejected before. ^.^