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Reversal

Type Power Accuracy PP Priority Damage Target
Fighting - 100% 15 0 Physical Single non-user
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
Arcanine UU Flash Fire / Intimidate 90 110 80 100 80 95 555
Blaziken UU Blaze 80 120 70 110 70 80 530
Dugtrio UU Sand Veil / Arena Trap 35 80 50 50 70 120 405
Furret NU Run Away / Keen Eye 85 76 64 45 55 90 415
Hariyama UU Thick Fat / Guts 144 120 60 40 60 50 474
Heracross OU Guts / Swarm 80 125 75 40 95 85 500
Hitmonlee UU Limber / Reckless 50 120 53 35 110 87 455
Houndoom UU Flash Fire / Early Bird 75 90 50 110 80 95 500
Kangaskhan NU Early Bird / Scrappy 105 95 80 40 80 90 490
Lucario OU Inner Focus / Steadfast 70 110 70 115 70 90 525
Medicham NU Pure Power 60 60 75 60 75 80 410
Miltank UU Thick Fat / Scrappy 95 80 105 40 70 100 490
Pikachu NU Static 35 55 30 50 40 90 300
Primeape NU Vital Spirit / Anger Point 65 105 60 60 70 95 455
Raichu NU Static 60 90 55 90 80 100 475
Raticate NU Run Away / Guts 55 81 60 50 70 97 413
Rhyperior UU Lightningrod / Solid Rock 115 140 130 55 55 40 535
Scizor OU Swarm / Technician 70 130 100 55 80 65 500
Scyther UU Swarm / Technician 70 110 80 55 80 105 500
Slaking NU Truant 150 160 100 95 65 100 670
Typhlosion UU Blaze 78 84 78 109 85 100 534
Vigoroth NU Vital Spirit 80 80 80 55 55 90 440
Yanmega BL Speed Boost / Tinted Lens 86 76 86 116 56 95 515