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Posted this in previous thread, but I know people like to see teams.
Misty 3/5, SS Red 5/5 (I know, shocker), SS Blue 3/5.
Misty and Blue help max your spdef and def, and I used the first sync on Blue to chunk him up a bit. Have a sturdy tank was the biggest factor imo. Once you get through phase 1 and 2 you can basically 2 shot him at the start of 3 with a high special attacker.