Vivillon (optimized 212 SpD) vs Scarf Genesect

Turn 1
100% of the time
Genesect uses Ice Beam/Thunderbolt/Flamethrower, Vivillon uses Sleep Powder

Turn 2
100% of the time
Genesect can't do anything, Vivillon uses Quiver Dance

Turn 3
66% of the time
Genesect can't do anything, Vivillon uses Quiver Dance
33% of the time
Genesect uses Ice Beam/Thunderbolt/Flamethrower and wins

Turn 4
50% of the time (if you make it here)
Vivillon uses Substitute, Genesect can't do anything, Vivillon attacks twice and wins
50% of the time (if you make it here)
Vivillon uses Substitute, Genesect uses Ice Beam/Thunderbolt/Flamethrower

Turn 5
100% of the time (if you make it here)
Vivillon uses Sleep Powder, Genesect can't do anything

Turn 6
66% of the time (if you make it here)
Vivillon uses Hurricane, Genesect can't do anything, Vivillon attacks again next turn and wins
33% of the time (if you make it here)
Vivillon uses Hurricane, Genesect uses Ice Beam/Thunderbolt/Flamethrower and wins