Healess Lance: X-Special, X Acc, Bite x2, Blizzard x4, Surf

ANY% (Exarion Route)
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85.60% to 3HKO /w 31
72.07% 3HKO /w 28-30

83% to 2HKO Bite Crit + Blizzard at 31
72% to 2HKO Bite Crit + Blizzard at 28-31

ROUND 2 (Gunner Route)
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(Level 53) [Assumes levelup on Agatha's 1st Gengar]
77.25% to 3HKO /w 28-31

77% to 2HKO Bite Crit + Blizzard at 28-31

(Level 54) [Assumes levelup on Haunter]
94% to 3HKO Bitex2 + Blizzard at 30-31
85.60% to 3HKO Bite x2 + Blizzard at 29
77.25% to 3HKO Bite x2 + Blizzard at 28

91% to 2HKO Bite Crit + Blizzard at 30-31
83% to 2HKO Bite Crit + Blizzard at 29
77% to 2HKO Bite Crit + Blizzard at 28

PROS
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Extra Flinch Chance on Lance
Rewarded for getting a Bite Crit (Turn 1)
Saves 12.26 seconds if you make it to Aerodactyl without healing
If you miss 1 Blizzard you don't have to Elixir mid fight

Cons
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The old fight isn't a range but this one is a favorable risk (Worth it to do the old fight at 28/29)