If you want the real experience on mobile, you can technically use a Switch Emulator (like Yuzu) on high-end Android devices (Snapdragon 695+ and 6GB RAM minimum) to run the official Nintendo Switch version of the game.
While you cannot play the official Dragon Ball Z: Kakarot on PPSSPP, you can experience a reasonable facsimile through community mods of Dragon Ball Z: Tenkaichi Tag Team . If you choose to download these files, proceed with caution, use antivirus protection, and ensure you are downloading from a reputable modding community rather than a random click-bait site. Dragon Ball Z Kakarot Ppsspp File Download
✔ Free (if you find a legitimate mod link) ✔ Captures the feel of DBZ fights on the go ✔ Some modders put real effort into cutscenes and boss fights ✔ PPSSPP allows save states, fast-forward, and upscaling If you want the real experience on mobile,
A file management tool needed to extract compressed (.zip or .7z) game files. ✔ Free (if you find a legitimate mod