There's always teaching over the Pokegear, so he can keep moving on. There are flyers around for the school's opening and that it's looking for teachers, so he could find one of those flying around, or a NPC speaking about it.
But if he ever does find out later and wants to become one then, send me a PM on this account. \o
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But if he ever does find out later and wants to become one then, send me a PM on this account. \o