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My opponent never responded to my VM, and doesn't seem to be a smogon frequenter, so I tried pm'ing him on PS. He responded once with a "oui ?" and then ignored my messages while getting random battles.
I contacted my opponent, who doesn't appear to be a smogon frequenter (their only post is the "in" post and they haven't been online since). I'll try and find them on PS, but consider this a tentative activity post for now.