PokillionaireNinnin Akihabara 2-go: 5/5 Diamond.
Cream of the crop selection across all eras. Prices are fair, and I got a free pack for writing a Google review.
I bought three Gold Stars in one session: Kyogre, Regirock, and Entei. Finding three Gold Stars at fair prices in a single shop almost never happens in Japan.
The main Ninnin branch across the street (4.5/5) is also spectacular.