1- Quicksave at the start. Throw a Fastball. Savescum until you hit a cup the first time.
2-
Always focus when it's the opposition's turn(Even if you hit 100%).
3-
Always select fastball to save AP. (At the start you might miss a lot, but eventually fastball will become effective with Focus' boost)
4- If the opp succeds and you have 2 remaining cups, then use bounce ball until you run out of AP.
5- If you lose just quick load
I have 15+ saves, every single one has minigames on, every single one had beer pong on the ep10 party. I think I had to use the 5th step only 4-5 times. It's not "ethical" by any means, but it works