Tao Village has been around for around a century and a half or so, so more than a couple generations for most Pokemon - but not even a full generation for others! The Rogues guild has existed for roughly that amount of time. The Merchants have existed for far longer, but not in the same form as the one PK runs (or Anana) - it was very closed, even moreso than how Anana runs Alomomola. The Rescuers guild is pretty much an infant compared to the other two, only having existed for a scant amount of time. I suppose something like 2 years.