A is that Budokai Tenkaichi 3 was officially released for the PSP. It was never ported to Sony's handheld. The PSP never received a direct port. The only official Dragon Ball entry on the PSP that uses the same 3D arena fighting engine is Dragon Ball Z: Tenkaichi Tag Team . This is the key to understanding the search term.
However, the "ISO" you are seeing is a massive fan-driven effort to recreate the BT3 experience on the PSP by an entirely different game: Dragon Ball Z: Tenkaichi Tag Team (TTT). The Core of the "PSP ISO" (Modding Scene) dragon ball z budokai tenkaichi 3 psp iso