Atticus is from the same round of promos as Mabostiff ex, since Mabostiff ex is out then so should Atticus187 is most likely Brassius because he's the Gym Leader of Artazon (the gold stadium). Brassius is also an older promo than Atticus.
Weird that we got a new Arven print that hasn't even been revealed in Japan but we still don't have the Violet Nemona.