This run can vary wildly depending on your luck with flinches so don’t give up if the luck just isn’t in your favor. I decided to pick up Wikstrom without a crit buffing tank since Wikstrom is completely self-sufficient – he buffs both of his attack and crit to the max(to max crit you need grid). Morty provides defenses for the times when I wouldn’t be able to change the forme to block a sync move. He also helps a lot with flinching which gives me enough time to build up sync buffs. Tauros’s job here is to buff speed up to 6. Do not forget to change formes when possible mostly when you know Regirock can hit hard: Sync/1Bar LowHP Earthquake/Entry bars rock slides. It will give you that extra bulk allowing you to survive some attacks at the end of the fight. As for a substitute for Tauros – support Seadra is the best option since they both do the same thing while Seadra has 1 gauge move making all the difference.
Grids:
https://ng-pomatools.web.app/pairs/14800/42900?s=5&l=140&r=4&p=0&a=0&g=AAECAwQFBggTFBUYGhwfISQsLg
-BP Morty
Grid note: You can pick up Trainer move MPR so you max out your defenses as an option. To get there, drop Synchro Healing node line.
https://ng-pomatools.web.app/pairs/5500/68100?s=5&l=125&r=4&p=0&a=0&g=AAECAwQFBggTGB0gISIuLw
-Wikstrom
Grid note: The only thing you can change is dropping top sync nodes to pick up MGR or Harry 3 on Iron Head – everything else is essential.