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Flail

Type Power Accuracy PP Priority
Normal - 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
Bellossom UU 75 80 85 90 100 50 480
Blastoise UU 79 83 100 85 105 78 530
Dodrio UU 60 110 70 60 60 100 460
Donphan BL 90 120 120 60 60 50 500
Espeon BL 65 65 60 130 95 110 525
Farfetch'd UU 52 65 55 58 62 60 352
Flareon UU 65 130 60 95 110 65 525
Forretress OU 75 90 140 60 60 40 465
Gyarados UU 95 125 79 60 100 81 540
Heracross OU 80 125 75 40 95 85 500
Jolteon OU 65 65 60 110 95 130 525
Kabutops UU 60 115 105 65 70 80 495
Kingdra BL 75 95 95 95 95 85 540
Kingler UU 55 130 115 50 50 75 475
Lanturn BL 125 58 58 76 76 67 460
Meganium BL 80 82 100 83 100 80 525
Ninetales UU 73 76 75 81 100 100 505
Parasect UU 60 95 80 60 80 30 405
Pinsir UU 65 125 100 55 70 85 500
Qwilfish UU 65 95 75 55 55 85 430
Sandslash UU 75 100 110 45 55 65 450
Seaking UU 80 92 65 65 80 68 450
Steelix OU 75 85 200 55 65 30 510
Sudowoodo UU 70 100 115 30 65 30 410
Tangela UU 65 55 115 100 40 60 435
Umbreon OU 95 65 110 60 130 65 525
Vaporeon BL 130 65 60 110 95 65 525
Vileplume UU 75 80 85 100 90 50 480