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