Its for what Oak says to you right before you choose between a boy and a girl... and so on. I don't think you choose a rival, if you do just skip that part and go on until he the talking before "your adventure unfolds"
text for the professor oak talking to you. Insert this text:
This is after the who introduction...
OAK: So much to do, so little time... Take your time. Don’t be
afraid. The door is still shut. Now, step forward. Can you do it?
*Chooses Boy or Girl*
If you give it form... It will give you strength. Choose well.
The power of the guardian. Kindness to aid friends.
Your path is set. Your story unfolds.
I mean... I'm working on what professor oak says to you (although it will be a different sprite)... Can you change his sprite, and change the mudkip (or nidoran watever) to a keysword??? I don't know how without screwing up the sprite order.