We used to have a meta thread for Friend Codes going back many many years, but the post got extremely clogged and messy. On a regular basis, it actually failed to load.
As such, it's not something we would consider starting again until the forum section arrives (eventually). For the time being, you should use user wall pages as well as the chat room if you want Friend Codes from this community specifically.
Honestly though: I don't know why anyone would come to us for Friend Codes when sites like Reddit have 10x better resources for that. Their platform is made for that stuff, unlike ours. Pages like /r/FriendSafari are stupidly active, considering X/Y are almost five years old now.