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Reversal

Type Power Accuracy PP Priority Damage
Fighting - 100% 15 0 Physical
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
Arcanine BL Flash Fire / Intimidate 90 110 80 100 80 95
Blaziken BL Blaze 80 120 70 110 70 80
Furret UU 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 / Reckless 50 120 53 35 110 87
Houndoom BL Flash Fire / Early Bird 75 90 50 110 80 95
Kangaskhan UU Early Bird / Scrappy 105 95 80 40 80 90
Lucario OU Inner Focus / Steadfast 70 110 70 115 70 90
Medicham BL Pure Power 60 60 75 60 75 80
Miltank BL Thick Fat / Scrappy 95 80 105 40 70 100
Pikachu UU Static 35 55 30 50 40 90
Primeape UU Vital Spirit / Anger Point 65 105 60 60 70 95
Raichu UU Static 60 90 55 90 80 100
Raticate UU Run Away / Guts 55 81 60 50 70 97
Rhyperior BL Lightningrod / Solid Rock 115 140 130 55 55 40
Scizor OU Swarm / Technician 70 130 100 55 80 65
Scyther UU Swarm / Technician 70 110 80 55 80 105
Slaking BL Truant 150 160 100 95 65 100
Typhlosion BL Blaze 78 84 78 109 85 100
Vigoroth UU Vital Spirit 80 80 80 55 55 90
Yanmega OU Speed Boost / Tinted Lens 86 76 86 116 56 95