That game wasn't all that great, in my opinion, Geno. The insanely high encounter rate, combined with the boring, and repetitive music made for a very annoying experience.
While the idea was neat, and the battle system was, while not original, decent for one of those Card based battle systems.
And Geno, to get that ending, not only does Vegeta need to live, but you must also turn Son Goku into a Super-Saiyajin. You do that by having Freiza kill off one member of your party. Then, you get to fight SSJ Vegeta at the end.
Don't get me wrong, I'm no DBZ fan, only and RPG fan. And so, I've played through it, as well.
However, I do own two Japanese games. Both are titled "Tales of Phantasia." One is on the SNES, and one is a remake for the PSX(1). I've played the SNES ROM, translated, so I knew the story and all. Otherwise, I don't think it could've been my favorite game of all time.