Anything that can't deal with smeargle with focus sash is not an anti-lead pokemon.
Victini used Trick!
the pokemon Swapped items!
smeargle is now dealt with, no more sash and it can't set up thanks to being choice locked. ( well, unless you're one of those weird smeargles that use spikes/toxic spikes.. in which case you can still set up somewhat.. but next turn victini can just one shot it with psychic)