Okay when you walk in the grass hell say:
"Hey! watch where your going.Hmmm do you know where I could find PROF.OAK?Well before I go there, lets have us a little battle!"
Than when inthe battle in you win it will say:
"What! defeated by a beginning trainer."
And after the battle:
"Well thanks for the warm up.I came from a far away region know as Hoenn,and I've been asked to find PROF.OAK.Well thanks and good luck."
And if the player decides to goto the lab or whatever before obtaing the parcel than have Brendan in outside the lab saying:
"Wow,so this is PROF.OAKs lab.Looks alot like PROF.BIRCHs to me"
Hey,thanks man and good luck!