Back when Pokemon was at the peak of its popularity, I used to own various pieces of, what I would deem to be, rare merchandise. Probably my most treasured possession was the original Charizard trading card. It seems to be much sought after nowadays and also commands a hefty price tag on eBay. Sadly I haven't been able to find the card or the majority of the rest that I collected in the early 2000's, but I still live with the faintest hope that they weren't thrown out years ago and were just misplaced deep in one of the corners of the loft at home. I think I would experience a joyous breakdown if that turned out to be the case. Still, I do have my first ever trading card to hand - the original Charmander card which came free with an issue of the Nintendo Official Magazine in a cardboard sleeve. Also on the subject of trading cards, my mom ordered a ringbinder from a TV-exclusive shopping channel which may or may not have been rare in its time. From what I remember, it was red, translucent and had anime art of a few Pokemon displayed on the front such as Snorlax, Charizard and Squirtle. I also had a hardback folder that stored trading cards, but I can't recall where I had it from.
I still own my original boxed copies of Red and Blue, as well as the Yellow version that I bought a few years later and Pokemon Stadium 1 & 2 plus Pokemon Snap. I'll post anything else as and when I remember it.