You have the ROM. Now you need to run it. Because the PSP is obsolete, emulation is superior to original hardware (higher resolution, save states, upscaling).
Disclaimer: This article does not host or provide direct download links. We encourage the legal acquisition of games. DRAGON BALL Z - TENKAICHI TAG TEAM ROM
If you own a legitimate copy of the game, creating or downloading a backup ROM exists in a legal gray area depending on your country. Here is the safest approach. You have the ROM
Unlike the floaty feel of Xenoverse 2, Tag Team runs at a snappy 60 FPS with instant teleport counters (Z-Counter). The ROM, when upscaled, plays faster than PS2 original. plays faster than PS2 original.