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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 Type Tier Abilities HP Atk Def SpA SpD Spe BST
Blaziken Fire / Fighting BL Blaze 80 120 70 110 70 80 530
Furret Normal NU Run Away / Keen Eye 85 76 64 45 55 90 415
Hariyama Fighting BL Thick Fat / Guts 144 120 60 40 60 50 474
Heracross Bug / Fighting OU Guts / Swarm 80 125 75 40 95 85 500
Hitmonlee Fighting UU Limber 50 120 53 35 110 87 455
Houndoom Dark / Fire BL Flash Fire / Early Bird 75 90 50 110 80 95 500
Kangaskhan Normal UU Early Bird 105 95 80 40 80 90 490
Medicham Fighting / Psychic BL Pure Power 60 60 75 60 75 80 410
Miltank Normal BL Thick Fat 95 80 105 40 70 100 490
Primeape Fighting UU Vital Spirit 65 105 60 60 70 95 455
Raichu Electric UU Static 60 90 55 90 80 100 475
Raticate Normal NU Run Away / Guts 55 81 60 50 70 97 413
Rhydon Ground / Rock BL Lightningrod / Rock Head 105 130 120 45 45 40 485
Scizor Bug / Steel BL Swarm 70 130 100 55 80 65 500
Scyther Bug / Flying UU Swarm 70 110 80 55 80 105 500
Slaking Normal BL Truant 150 160 100 95 65 100 670
Typhlosion Fire BL Blaze 78 84 78 109 85 100 534
Yanma Bug / Flying UU Speed Boost / Compoundeyes 65 65 45 75 45 95 390