Board Thread:General Discussion/@comment-44013608-20200108015317/@comment-26907577-20200108022106

Nothing.

Undertale doesn't keep track of how many Genocide Routes you've done- just if you've done one at all. So there's special dialogue on Genocide 1, Genocide 2, stop. Then the second dialogue repeats on subsequent routes. Relatedly, the game doesn't uninstall after 6 Genocides, since it doesn't keep count. Who told you that?

Anyway, Route #30 is the same as Route #2.