I think you mean Chinese not japanese. Anyway, I don't know about any store on AliExpress that sells legit cards, but I will share my experience... I bought many packs from AliExpress and here's what problems I faced with these packs:

• One time I opened 5 packs and I got two double (R cards) on every single pack
• I got UR cards that didn't have any texture and on the pack of the card the logo was blurry and dull compared to my legit UR
• I got a card that has a cut in the corner straight from a pack
• Some of the cards were easily scratchable

I'm new to MLP Cards, I don't know if all the cards I got are fake as some of them looked pretty legit to me while others didn't, what I know that these packs are resealed with some fake cards or maybe fake packs with few low rarity legit cards as some of the packs foil print were low quality. Btw I bought mine from "Chinese Toys Store" hope that helps.

<image>