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Forewarn

Description

Alerts the wielder to the opponent's move that has the highest Base Power when the user switches in. If two moves are of the same Base Power, Forewarn randomly selects one. In doubles, Forewarn will only reveal one move total, not one move from each opponent. It selects the highest power move from the two opponents. Forewarn will immediately activate whenever the ability is acquired, such as through Skill Swap or Role Play. All moves without a Base Power are assigned a power, according to the list below.

Assigned Base Power Moves
160 Fissure, Guillotine, Horn Drill, and Sheer Cold
150 Eruption, Water Spout
120 Counter, Metal Burst, and Mirror Coat
80 Crush Grip, Dragon Rage, Endeavor, Flail, Frustration, Grass Knot, Gyro Ball, Hidden Power, Low Kick, Natural Gift, Night Shade, Psywave, Return, Reversal, Seismic Toss, SonicBoom, Trump Card, and Wring Out
1 Everything without a fixed Base Power not listed above.

Competitive Use

Forewarn is a useful scouting tool, albeit a bit gimmicky and unreliable, but most Pokemon that receive it have a better ability option. Hypno receives Insomnia, Jynx has Dry Skin, and Musharna can use either Synchronize in singles or Telepathy in doubles. Opt for one of those options over Forewarn and you'll usually find yourself with a greater deal of success.

Found normally

Pokémon Type Tier Abilities HP Atk Def SpA SpD Spe BST
Drowzee Psychic LC Insomnia / Forewarn / Inner Focus 60 48 45 43 90 42 328
Hypno Psychic NU Insomnia / Forewarn / Inner Focus 85 73 70 73 115 67 483
Jynx Ice / Psychic NU Oblivious / Forewarn / Dry Skin 65 50 35 115 95 95 455
Munna Psychic LC Forewarn / Synchronize / Telepathy 76 25 45 67 55 24 292
Musharna Psychic NU Forewarn / Synchronize / Telepathy 116 55 85 107 95 29 487
Smoochum Ice / Psychic LC Oblivious / Forewarn / Hydration 45 30 15 85 65 65 305

Found in Dream World

Pokémon Type Tier Abilities HP Atk Def SpA SpD Spe BST