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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
Furret UU 85 76 64 45 55 90
Heracross OU 80 125 75 40 95 85
Hitmonlee UU 50 120 53 35 110 87
Houndoom BL 75 90 50 110 80 95
Kangaskhan BL 105 95 80 40 80 90
Miltank OU 95 80 105 40 70 100
Primeape UU 65 105 60 60 70 95
Raichu UU 60 90 55 90 80 100
Raticate UU 55 81 60 50 70 97
Rhydon OU 105 130 120 45 45 40
Scizor BL 70 130 100 55 80 65
Scyther UU 70 110 80 55 80 105
Typhlosion UU 78 84 78 109 85 100
Yanma UU 65 65 45 75 45 95