These are the only locations outside of Japan. Copy-pasted from
Bulbapedia:
USA
Seattle, Washington
The Pokémon Company International is headquartered in Bellevue, a city that neighbors Seattle.
Northgate Mall
Pokémon Center kiosk in the Northgate Mall in October 2010
* Opened summer 2010
* 401 NE Northgate Way, Seattle, Washington, 98125
This standalone kiosk in the mall's common area is a vending machine that sells five types of Poké Dolls, several Monster Collection figures, trading cards, and Nintendo DS games. It also features interactive games and a Pokédex for visitors to play with.
Alderwood Mall
* Opened November 2010
* 3000 184th Street SW, Lynnwood, Washington, 98037
This shop is the larger of the two Seattle-area shops, but it is still in the mall common area and limited in size. It features a larger vending machine kiosk, a tower of Poké Dolls and DX Poké Dolls, and The Pokémon Company International employees who answer questions and ring up sales.
Tacoma, Washington
Tacoma Mall
* Opened ???
* 4502 S Steele St # 1177, Tacoma, WA 98409
This shop is located in the mall common area. It features two vending machines, each offering a selection of up to ten Poké Dolls, the five Nintendo DS Pokémon games, thirteen miniature Monster Collection figures, seven different packs of trading cards, and five full decks of trading cards. The stand also includes two large displays of Poké Dolls, varying in sizes from 6" to 12", as well as a variety of other Pokémon merchandise. Each of the machines are also equipped with several interactive games as well as a touch-screen Pokédex for visitors to enjoy. The stand is watched and operated by one to two The Pokémon Company International employees, who help make sure the machines are running alright, answer questions, and ring up the sales of merchandise located outside of the vending machines.
New York, New York
New York (Nintendo World Store)
* Opened November 16, 2001
* 10 Rockefeller Plaza, New York, 10020
* Phone: (212) 307-0900
In January 2005, Pokémon Center New York closed for remodeling. It reopened as a general Nintendo store called Nintendo World on May 14, 2005, no longer as a Pokémon-exclusive store. However, there is a section in the ground floor devoted to the franchise. In addition, there is a large selection of Pokémon dolls, figures, video games and trading cards located on the ground floor. The dolls are either imports from Japan or old dolls from the old Pokémon Center. They also have newer Pokémon games, figures, and clothes/apparel. On the floor above is a register and Mario, Kirby and The Legend Of Zelda Collectibles. Sometimes in the store there might be Pokémon candies or edible foods. On December 19th 2010 near Christmas time, there was a larger selection of Pokédolls and other collectibles. There was Spiky-eared Pichu, Latios, Latias, Mew, Kyorge, Groudon, Ho-Oh, Lugia, Pikachu, Arceus, Suicune, Entie, Raikou and Eevee. Sometimes they would have T-Shirts and exclusive Nintendo World collectibles. Nintendo World also has Video game strategy guides and some of the Pokémon games for Nintendo DS or Nintendo Wii. They are also having an event for Pokémon Black and White, when it comes out. They also have Pokémon Black and White pre-orders available.