Cardon in Akihabara: 5/5 Diamond.
Phenomenal variety in singles across all eras at fair prices. What sets Cardon apart: they may negotiate on expensive cards. Be respectful and you can score a deal.
I found a Gold Star Torchic here. The selection spans old back Japanese cards, ex era, Diamond and Pearl, Black and White, and Modern.
If you collect across eras, Cardon is essential.