what is the difference between XXXX roms and [1223] roms

guys what is the difference between XXXX roms and those which have numbers on it ???

XXXX releases can be a few things.- Non-scene releases: basically just releases that are made by people who are not in the scene (release groups)
- Nukes: a release that is nuked for any reasons will be made XXXXA numbered release is a release that has no problems and is properly released by the scene.
Our numbering is screwed up by the way, so don't go searching for releases via numbering.

XXXX could also applied for DEMO roms, wich are uploaded bye poeple of the scene.

traditionally xxxx indicates a rom of something not commercially available (like the pokemon distribution roms).

so the number we see in [1231] like aregiven by scene groups and not Nintendo ????

strictly speaking they're assigned by rom sites.

Neon32 · #5so the number we see in [1231] like aregiven by scene groups and not Nintendo ????

Nope.
ROM sites and release sites like GBAtemp and DS-Scene make up the numbering.
Everyone is different at the moment.