Definitely have the guy do the room to code. If he would do it against code, I wouldn't hire him. As I understand it the new standard is 20A circuits with 15A receptacles with 20A pass thru.
I think he is asking what are things to consider when planning to build a game room.
If I were to build a new game room then these are what I would do.
A door 32" wide or wider so you can get them in and out easily. If it is a garage then this isn't an issue.
At least one 20A circuit per 4 pins. Yes, you can run more but this gives you some flexibility for when you buy more. You will buy more as long as you have space.
Plan the floor plan accordingly. Don't forget to add in the space needed to remove the playfield glass.
A separate circuit for lights. Need bright lights on the ceiling so you can see what you are doing when working on the pins. I would put in rope lights around the side of the walls, ensconced or whatever it is called, so you can have indirect lighting but no glare when playing the pins.
Do you plan on having neon lights, TV, clocks, or other powered items on the walls? I would run a receptacle to those position(s) so you can hide the cords.
Speakers mounted on the walls or in the cieling with the wires run behind it.
Some sort of lightning/surge protection in the panel. These can get expensive but...