Event Hacking question

This also won't work, but probably won't matter if you can't talk to Umaro. If you can, his event needs to go somewhere relevant, rather than the middle of some other event which will likely crash the game.

The bit ('If mem set') you're using for him is fine.

As I"m incredibly knew to this (you may have noticed), where would I find relevant events to put with Umaro in the level editor? How do you know which are relevant and good to use and which are not? Thanks.