Rockstar Games' stands as one of the most technologically advanced video games ever made. Its massive open world, photorealistic graphics, and complex artificial intelligence require the immense computing power of modern consoles and high-end PCs.
If you insist on using the PSP:
If a website offers an "exclusive download" of a AAA 2018 game for a console that died in 2014, it is a trap. Do not click.