Vixzey
Member
He hasn't done that yet this saga ( with Pokémon, at least, no excuses for Nurse Joy). Lana also keeps mentioning it, so there's no reason for him to not know.
As far as I have noticed, he did once, with Mienshao in the ping pong episode, where he asked rotom what it was, however this was in Norwegian dub, so it may have transpired differently in jap/english.