OR is Omega Ruby. It’s the 3DS Remake of Ruby (Gen 3).

As for what I play Platinum on, I keep transferring the save around. Usually I play on 3DS with TwilightMenu++, but I actually just got a flashcart in today that lets me play Platinum on a DS Lite which is what I spent basically all day playing.

A few screenshots ago (and by a few I mean like Januaryish i think) I did Emerald and 100% the Hoenn Pokédex. I did that one on an emulator and it was fun