Thanks guys and sorry. I was just in between Veilstone and Pastoria city when I posted this. And I'm going to keep it because, you're right, it is a useful move.
I have a few questions though....
1) How will going to Pastoria City when I have a Heart Scale teach it Thundershock?
2) Where do I get a Light Ball?
And yeah I was getting into breeding the last time I played but I never really did any research on it. Guess I could try breeding again but my Pichu is already a lv. 10 but I really want him to have some physical attacks.
Thanks for the advice btw.