My best play? I was playing 1 on 1 against a really good Ryu as Ganondorf. We both had high damage and were on our last stock. Both of us had each other with pretty much everything, but neither one of us could land the final blow.
I manage to trick Ryu into trying a Focus Attack, and then use Warlock Punch at the same time. The Super Armor of the Warlock Punch absorb the Focus Attack preventing him from stunning Ganondorf. I unleash the Warlock Punch on the last few frames of his Focus Attack when the super armor effect is gone.
So, we both use our attacks with Super Armor, but I win out and send him flying, winning the match.
I was so happy and overjoyed, I forgot to save the match! But it is the best feeling to have won a match with Warlock Punch of all things.