Forewarn shows the opponent’s move with the highest base power. If two or more moves are of the same base Power, one will be chosen at random.
In a Double Battle, Forewarn will only show the highest base power move out of the two opponents. If both opponents have a move with the same base power, one will be chosen at random.
Moves without a base power that can cause damage are assigned one.
One-hit knockout moves (Fissure, Guillotine, Horn Drill, Sheer Cold)
||Eruption, Water Spout
||Counter, Metal Burst, Mirror Coat
||Crush Grip, Dragon Rage, Endeavor, Flail, Frustration, Grass Knot, Gyro Ball, Hidden Power, Low Kick,
Natural Gift, Night Shade, Psywave, Return, Reversal, Seismic Toss, Sonic Boom, Trump Card, Wring Out
||All other damaging moves without fixed powers
In Pokemon Mystery Dungeon: Explorers of Time and Explorers of Darkness, a Pokemon with Forewarn occasionally evades moves, evenmoves that never miss.
Outside of battle
Forewarn has no effect outside of battle.
Pokemon with Forewarn