The Pokemon Company has written an article informing customers what they can do and get at Pokemon Cafe Japan.
First, by ordering a beverage off the drinks menu, customers can receive one of the six coasters for free. Designs include Pikachu, Snorlax, Bulbasaur, Charmander, Squirtle, and a mystery Pokemon.
Second, every seat is prepared with a free luncheon mat featuring one of the 151 original Kanto Pokemon. You can bring this luncheon mat home.
Lastly, you can meet and take photos with the Chef Pikachu and Waitress Pikachu mascots who only appear at the cafe.