Event Hacking question

What I meant by 'relevant event' is an event that doesn't do something else. You have Umaro's event pointing to 1E8F6; event pointers are relative to bank CA, so this is actually pointing to CB/E8F6, which is right in the middle of the escape from the burning house event. You'd likely see some really funky stuff before the game just up and crashed.

As for how to find what event to point him to, you will need to cross-reference things with the event dump. You can open that up and do a search for "Umaro," and you'll find a couple places you can point his event to that won't crash the game.