But Yokai Watch was a crossover event and crossover event rewards are still the exception in the mogstation, and not the rule. I think Lightning gear is the only crossover event reward in the mogstation.
It will be a nice surprise if it show up, but I will not expect it because there are no demanding threads every month about it like it was with Lightning. The demand just don't exist.
And SE don't own Yokai, so it is a matter of if SE is allowed to sell it after the event ended or if obtaining the rewards is limited to the event