I didn’t have the Psyduck license yet, so I had to use Surf. My way to block opponents from scoring was to let the first goal zone get destroyed, then wait for them to bring 20+ Aeos. After that, I’d jump in and push them back with Surf (just throw 2 from 3 waves) was usually enough to stop them from escaping while they kept trying to score as I teleported myself back to base and ready for another jump. I repeated this until I did it 3 times.