People complain about Shadow Rider having too many sets that can blow past its usual checks, but lets compare it to GSC Lax. Lax can customize its moveset to choose its checks. Fire Blast for Skarm/Lix, Belly Drum for Miltank, Thunder for Cloyster, Self-Destruct to break ...
I think Chien Pao is a better partner than Deoxys-A is for Fezandipiti and that's because the original two doesn't do very nicely into Necrozma-DM; sure Deoxys-A has Shadow Ball but NDM can easily trade with it and at that point your left with banking on Zygarde or...