A team has finished a game with 6-15-4 runs-hits-errors line 25 times since 1897, most recently Boston Red Sox on 9 September 1981. That is about one every 17,720 team-games.
Box score for the most recent one ↗
6-14-4 6-14-9 6-15-3 6-15-1 6-15-2 6-15-6 6-15-4 6-15-0 6-15-5 6-15-7 6-16-3 6-16-1 6-16-2
The whole distribution — Runs-Hits-Errors Lines · All 18 shapes