Must have been super rare if it was Goodtools is one of the sets that tends to find old translations, versions and whatever else and add them to the list, and even ignoring the Chinese stuff it might well have tile hacked versions that romhacking.net (
http://www.romhacking.net/?page=tra...100&order=&dir=&title=&author=&transsearch=Go should be all the German translations there, as a rule the site does opt for things of some quality/notability to avoid the "I changed the starter pokemon" problem but I can't imagine something that old and even flawed would be skipped if known about), zophar's domain (
https://www.zophar.net/ https://www.zophar.net/search?search=dragon mentioning nothing) and whatever else lack. There were tourist trap ? in 1 carts at the time so I could well imagine there being someone dumping a translation on a cart and flogging that, though my knowledge of the German scene around that time is basically non existent, and various law changes as well as general attrition saw a lot of vintage German emulation/ROM hacking/news sites vanish.
https://github.com/kelledge/goodtools/blob/master/goodtools.gbx.txt
This is their entire list for Dragon Ball
Code:
Dragon Ball Z - Densetsu no Chou Senshitachi (J) [C].gbc
Dragon Ball Z - Gokuu Gekitouden (J) [S].gb
Dragon Ball Z - Gokuu Hishouden (J) [S][b1].gb
Dragon Ball Z - Gokuu Hishouden (J) [S][b2].gb
Dragon Ball Z - Gokuu Hishouden (J) [S][b3].gb
Dragon Ball Z - Gokuu Hishouden (J) [S].gb
Dragon Ball Z - Gokuu Hishouden (J) [S][T+Chi].gb
Dragon Ball Z - Guerreros de Leyenda (S) [C][!].gbc
Dragon Ball Z - I Leggendari Super Guerrieri (I) [C][!].gbc
Dragon Ball Z - Legendaere Superkaempfer (G) [C][!].gbc
Dragon Ball Z - Legendary Super Warriors (E) [C].gbc
Dragon Ball Z - Legendary Super Warriors (U) [C].gbc
They do have other German translations; do a page search on the link for "T+Ger" and it includes some very obscure things.
I would presume you remember the game well enough that it is not the "Legendaere Superkaempfer" version.
If you are really bored you might find something in
https://web.archive.org/web/*/http://bubbz.pocketheaven.com/* that the other two lack but the index does not appear to be there so you will be going a bit more manual.