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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
Bellossom UU 75 80 85 90 100 50
Blastoise UU 79 83 100 85 105 78
Dodrio UU 60 110 70 60 60 100
Donphan BL 90 120 120 60 60 50
Espeon BL 65 65 60 130 95 110
Farfetch'd UU 52 65 55 58 62 60
Flareon UU 65 130 60 95 110 65
Forretress OU 75 90 140 60 60 40
Gyarados UU 95 125 79 60 100 81
Heracross OU 80 125 75 40 95 85
Jolteon OU 65 65 60 110 95 130
Kabutops UU 60 115 105 65 70 80
Kingdra BL 75 95 95 95 95 85
Kingler UU 55 130 115 50 50 75
Lanturn BL 125 58 58 76 76 67
Meganium BL 80 82 100 83 100 80
Ninetales UU 73 76 75 81 100 100
Parasect UU 60 95 80 60 80 30
Pinsir UU 65 125 100 55 70 85
Qwilfish UU 65 95 75 55 55 85
Sandslash UU 75 100 110 45 55 65
Seaking UU 80 92 65 65 80 68
Steelix OU 75 85 200 55 65 30
Sudowoodo UU 70 100 115 30 65 30
Tangela UU 65 55 115 100 40 60
Umbreon OU 95 65 110 60 130 65
Vaporeon BL 130 65 60 110 95 65
Vileplume UU 75 80 85 100 90 50