PSA Grading

I want to grade my Pichu and Hoppip E3 Promo (English Front/Japanese Back)

I was wondering if PSA would grade them since they’re never been graded before. I have 2 cards that might get a PSA 10.

Why wouldn’t they accept them?

They might not accept them because they have no info on them. The same thing has happened with various other promos, such as the Trainer Deck A and B cards. PSA has to be able to label the cards correctly to grade them - if they can’t find a legitimate source to give them the correct info to put on the label, they won’t grade the card.