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Reversal

Type Power Accuracy PP Priority
Fighting - 100% 15 0
N = floor(64 * User's current HP / User's total HP)
Value of N Base Damage
0-1 200
2-5 150
6-12100
13-21 80
22-42 40
43-64 20

Alternately, you could do it as a direct function of your % HP, although this value could be off on borderline cases due to rounding.

% HP remaining Base Damage
0% - 3.124% 200
3.125% - 9.374% 150
9.375% - 20.3124%100
20.3125% - 34.374% 80
34.375% - 67.1874% 40
67.1875% - 100% 20
Pokémon Tier Abilities HP Atk Def SpA SpD Spe
Blaziken OU Blaze 80 120 70 110 70 80
Furret NU Run Away / Keen Eye 85 76 64 45 55 90
Hariyama BL Thick Fat / Guts 144 120 60 40 60 50
Heracross OU Guts / Swarm 80 125 75 40 95 85
Hitmonlee UU Limber 50 120 53 35 110 87
Houndoom BL Flash Fire / Early Bird 75 90 50 110 80 95
Kangaskhan UU Early Bird 105 95 80 40 80 90
Medicham OU Pure Power 60 60 75 60 75 80
Miltank BL Thick Fat 95 80 105 40 70 100
Primeape UU Vital Spirit 65 105 60 60 70 95
Raichu UU Static 60 90 55 90 80 100
Raticate NU Run Away / Guts 55 81 60 50 70 97
Rhydon BL Lightningrod / Rock Head 105 130 120 45 45 40
Scizor BL Swarm 70 130 100 55 80 65
Scyther UU Swarm 70 110 80 55 80 105
Slaking OU Truant 150 160 100 95 65 100
Typhlosion BL Blaze 78 84 78 109 85 100
Yanma UU Speed Boost / Compoundeyes 65 65 45 75 45 95