It sounds like you're referring to a scene release collection of Nintendo DS ROMs, typically numbered from 0001 (often Super Mario 64 DS) up through 4851 (a later 2010s release), plus some unnumbered or homebrew/translation entries.
: Numbers typically follow the chronological order in which a "dump" (digital copy) was made available online. Regional Differences Nintendo DS Roms 0001 - 4851 Some Unnumbered ...
Beta Versions: Early builds of games like Resident Evil: Deadly Silence. It sounds like you're referring to a scene
As Taro prepared to leave the shop, Mr. Tanaka handed him a small, unnumbered Rom. "A gift, for your troubles," he said with a smile. Demo and Sample Roms : Demo versions of