I want to speedrun a Pokemon game and i decided between this two. Is there a big difference between these two and what should i try to start speedrunning? I prefer Platinum.

If you're doing glitchless you just need to learn the different movement for the first part of the game so you can get the proper manip, other than that P uses Empoleon and D/P uses Infernape

Just try the game, that you like the most and you know the most about. Its more or less a preference thing.

Thanks for the reply.

Hello everyone. Pokemon is one of the coolest games on consoles and I remember how I played it at school and my teachers just hated me
At first I had a simple version, but then my mother gave me a cartridge with a platinum version and I can’t even describe how happy I was. Seriously, it was the best day of my life. Ohh, such memories are simply not forgotten and I will remember this forever. Even now, when I downloaded Pokemon Platinum ROM from https://romsie.com/pokemon-platinum-version-us-nintendo-ds-rom and play on the emulator, I still remember these feelings I am glad that there is excellent picture quality and the frame rate is also amazing!