Well close on hand I have a container with Ruby, Emerald, and Fire Red on GBA, as well as a single case inside the container that has Pearl, Platinum, Heart Gold, Black, Black 2, and Mystery Dungeon Explorers of Darkness, and another case that has Conquest. I keep the container on a bookshelf, which I keep a strategy guide for Yellow version, a guide for Platinum version, Diamond & Pearl Pokedex, Pokémon Platinum strategy guide, Black and White official strategy guide & Unova Pokedex, Black 2 & White 2 Pokedex & Guide, X & Y guidebook and X & Y Pokedex. I keep some small computer equipment nearby on a shelf in a Pokeball like capsule I got a phone strap from (just a small thing I think is a little humorous for how items on the ground look in games). I have plushies including a Cyndaquil and a Substitute, I was happy when I found I could get the particular dolls for bases in Omega Ruby, and a Mega Mawile figure. And of my favourite Pokémon, I have a not too small male Meowstic plush stuck in a standing position, and I have a larger female Meowstic plush and I am very happy with. All of these are on my bookshelf.
Going over to my current gen games, I have a game case in the shape of a Pokeball I got for pre-ordering Y version as well as Y version, Omega Ruby, Mystery Dungeon Gates to Infinity, and Pokémon Rumble. Other where in my room I have a Pikachu hat that came with Lootcrate. I have a really old Pikachu plush among some random knickknacks, somewhere I have my Pokémon card collection that is pretty much a lot of the pretty old stuff including what I am pretty sure was a fully finished sticker book, and a complete folder holographic cards that came in chip packets years back.
I have not often gone out of way to try and get as much of a Pokedex filled out as possible, I think the last time of that was with Black version I got 294, which does not look like a lot, but I managed to get a large amount of Legendaries. Actually, I think I might set the goal to finally capture all Pokémon when Moon version comes out, Legendary Pokémon are being released this year once a month, so I think that it might actually be doable if I get Pokémon Bank. I will try and pool all of the Pokémon games I played.
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Through dream I travel, at lantern's call
To consume the flames of a kingdom's fall