How to put Pokemon Red on PSvita?

To play Pokémon Red on a PS Vita, you'll need to use a PlayStation emulator like Adrenaline, which allows you to run PSP games. First, ensure your PS Vita is hacked with Custom Firmware (CFW). Then, download a Pokémon Red ROM and place it in the appropriate directory on your Vita. Finally, launch Adrenaline and load the ROM to start playing.