However, this phrase appears to be a title or label (likely a repack of software, game files, or music — "Mr. DJ" being a common alias in repack scenes). In English,
It looks like you're asking for the correct article (e.g., "a," "an," "the") to use with the phrase bully repack mr dj
So the correct form is simply: If you absolutely need to use an article (e.g., in a sentence), use "the" (since "repack" is a countable noun referring to a specific release): "I downloaded the Bully Repack Mr DJ." But without context, the most proper, standard way to write/use it is no article at all . However, this phrase appears to be a title