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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 HP Atk Def SpA SpD Spe BST
Furret UU 85 76 64 45 55 90 415
Heracross OU 80 125 75 40 95 85 500
Hitmonlee UU 50 120 53 35 110 87 455
Houndoom BL 75 90 50 110 80 95 500
Kangaskhan BL 105 95 80 40 80 90 490
Miltank OU 95 80 105 40 70 100 490
Primeape UU 65 105 60 60 70 95 455
Raichu UU 60 90 55 90 80 100 475
Raticate UU 55 81 60 50 70 97 413
Rhydon OU 105 130 120 45 45 40 485
Scizor BL 70 130 100 55 80 65 500
Scyther UU 70 110 80 55 80 105 500
Typhlosion UU 78 84 78 109 85 100 534
Yanma UU 65 65 45 75 45 95 390