How do I make events activate when the player enters a map?

[Froakie34]

In my game, I'm trying to have the rival walk up to you and battle you after you exit the professors lab. How would you get the event to activate after you exit the lab.", and get it to not show up again.
Also, How would I get the parent of the child to walk up to the player as soon as they get down the stairs, and face the player while talking?

Thank you in advance,
Froakie34

 

[Nickalooose]

This is all to do with eventing through RMXP, not Essentials... You can Google tutorials on how to do such things...

Have at least 3 pages on your event, page 1 needs to be blank, page 2 needs to have a switch or variable activation, in which the activation should be part of Prof. Oaks speech and page 2 should have an auto-run trigger, page 3 should have another switch or variable activation and should also be blank.

I suggest learning the basics in RMXP and you can kind of guess what everything else does and how it all works.