For this strategy, just like the previous Latios video, I used Steven + two F2P units to clear VH Entei on Auto. This recording is also the first run that I did but the gist of it is to use Torchic to help Metagross reach +6 Atk +2 Crit for 80% crits on Iron Head and 50% crit on Sync since Metagross has to forgo Bullet Punch Eagle Eye 9 to get Natural Remedy for the Hostile Environment 9 Heat Wave in his final bar. I missed a ton of crits with Iron Head and was still able to clear with plenty of health left, so it should be safe to say that this strategy is also fairly consistent.
Steven Sync Grid :
Skyla Sync Grid :