They better serve berries.
There's a lot of pictures and menu items at the link, but I'll just post a few choice selections.
And of course, if you bring your 3DS you get a special "Pokemon Cafe Pikachu" with Play Nice, Charm, Nuzzle, and Sweet Kiss. It's holding a Sweet Heart. I expect it to be banned from Smogon immediately.

To celebrate the release of Pokemon Omega Ruby and Alpha Sapphire, THE GUEST cafe & diner, a restaurant inside the Shibuya Parco building, will mega-evolve into a Pokémon-themed cafe for a limited time starting this January. They will offer a wide variety of meals, desserts, and drinks to fully restore the HP of all Pokémon trainers and their loyal Pokémon friends.
If you missed the Pokémon cafe in Roppongi last summer, nows your chance to catch it again. The Shibuya Pokémon cafe is scheduled to be open from January 9, 2015 until the end of February. So if youre a fan of the series, or just like to eat food with cute faces staring back at you, mark your calendar now. The cafe wont take reservations, and theyre expecting big crowds, but based on whats on their menu it definitely looks worth checking out.
There's a lot of pictures and menu items at the link, but I'll just post a few choice selections.

Pikachus Favorite Hamburger Steak 1,380 yen ($11.50)
Were not sure how much choice Pikachu was given in deciding his favorite hamburger steak, but we cant argue with what he picked. The hamburger meat is actually packed together with mashed potatoes and hidden underneath the Pikachu head, which is made of egg. Pikachus red cheeks are little peppers, and his ears are made of monaka, a crispy wafer. The orange cubes in the salad are Pokéblocks (basically candy for Pokémon), and the blue thing is allegedly a Rare Candy. The cafe cant guarantee any leveling up as a result of eating it though.

Primal Groudons Fireblast Mapo Tofu 1,280 yen ($10.70)
The first non-Pikachu item looks pretty sizzling, with mapo tofu (fried pork and tofu with spices) surrounding the Pokéball in the pan. It comes with red rice and a fireblast-shaped salad, for maximum fire-breathing potential. Since its aimed at kids, its relatively mild, but if youre a fire-type at heart, they provide some optional extra kick in a bottle for you to shake on.

Pikachus Electric Shock Parfait 980 yen ($8.20)
If Pikachus sweet pancakes just arent quite sugary enough for your liking, then try this. Its a giant wad of cotton candy stuck inside a mixture of mango mousse and pineapple gelatin. If the sugar rush doesnt shock you into paralysis, nothing will.

Hot/Iced Pikachu Latte 680 yen ($5.70) and 780 yen ($6.50)
Choose from a hot or iced Pikachu latte. The hot one comes with a Groudon or Kyogre cookie, and the cold one comes with the horror of having to rip off Pikachus ears and drink his face.
The cafe is also offering a ton of other incentives to come visit, like the free coaster you get with each drink order.
And of course, if you bring your 3DS you get a special "Pokemon Cafe Pikachu" with Play Nice, Charm, Nuzzle, and Sweet Kiss. It's holding a Sweet Heart. I expect it to be banned from Smogon immediately.