At Rank 8, visitors are able to introduce the player to a facility that can be placed in the Plaza for a fee
The easiest way to get it is to have someone else from you Festival Plaza have it, or luckily getting it from Sophocles. Rank 8 takes 281 Festival Coins, in case you were wondering. :P
Also, just a heads up, Rare Kitchen 5 is useless in Moon/Ultra Moon. Rare Kitchen 5 only gives you more things than Rare Kitchen 4 in Sun/Ultra Sun. Essentially, if you have Moon/Ultra Moon, Rare Kitchen 5 is the same as Rare Kitchen 4. :P
Hope I helped!