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>Victini outclassing Darmanitan
Make Darmanitan's Zen Mode work like Schooling where it's unable to stay focused/gets angry after taking too much damage. Give it Trick Room, Psychic Terrain, Calm Mind, Recover(Medicham, another meditating psychic type gets it and majority of pokemon who learn it are psychic type. This helps it use its defensive stats better due to its bad defensive typing. Also, normal darmanitan is to frail to really abuse this) and Speed Swap for Status moves. For attacks, it needs more special coverage. Aura Sphere(its Zen form seems capable of using it from its focus), Psyshock, Stored Power(it basically keeps its psychic power locked away when not in Zen Mode), Ancient Power(Pokedex compares Zen Mode to hardening into stone. Mostly for Z-move trapping.) and Dark Pulse(it already gets physical dark moves in Fling and Thief).
This way, Victini has physical attacking fire/psychic down and Zen Mode Darmanitan does special better than Victini, as well as Defensive. Furthermore, if Darmanitan gets taken low enough to leave Zen Mode without fainting, it gains enough speed to get a hit off before fainting.