1. Play a game with two controllers. Doesn't matter how many innings. Play as home.
2. Play as The Bullies, since there are more power hitters.
3. Go through the game scoreless until the bottom of the last inning.
4. Have the 2nd controller lob fast balls at you, while you try to knock them out. Press up on the left stick while pressing B.
5. If you don't do it the first time, keep trying. It doesn't have to be the first batter of the inning. If you're about to score, just make your runner jump and pick them off.
6. If necessary, go to extra innings.
I got this in a 5-inning game, 0-0 in the bottom of the 5th. My first batter flew out to deep center. My next two batters hit deep singles. My fourth batter knocked it out, and it popped.