Great collection! I meant to post a while ago, but I think I forgot to follow up because I was looking through your collection thread at work.
I don’t know if it’ll be of interest (or if you have these already), but a fun new chase for you might be the “Pikablu” PSA label errors in the early days of grading (see this thread). From the thread, it looks like you can find this label on both the Japanese Southtern Islands Marill and the Corocoro promo Marill.
Just thought I’d put that out there in case if tickles your fancy!