I would go as far as to say that they don't even have had to be taught by anyone unless you specifically want it that way. Unless you intend on copying the mechanics of monk down to the skill names, you could simply say that his parents/grandparents developed a similar technique on their own and taught it to him. Believe me, there are plenty of more off the wall explanations for skills and powers in the roleplay community.
That said, I have never leveled monk and have not seen any of the cut scenes from the quests so I do not know if there is anything preventing someone from copying or developing similar techniques on their own. All I know is that it isn't an absolute no go like white mage is.
That said, I have never leveled monk and have not seen any of the cut scenes from the quests so I do not know if there is anything preventing someone from copying or developing similar techniques on their own. All I know is that it isn't an absolute no go like white mage is.