✨ Forewarn | Gen 5

Effect:

When this Pokémon enters battle, it reveals the move with the highest base power known by any opposing Pokémon to all participating trainers. In the event of a tie, one is chosen at random. Moves without a listed base power are assigned one as follows:

Power | Moves:
150 | OHKO Moves, Eruption, Water Spout,
120 | Counter moves: Counter, Metal Burst, and Mirror Coat
80 | Moves with Variable power or set damage like: Dragon Rage, Frustration, Gyro Ball, Heat Crash, Seismic Toss, etc.
20 | Stored Power, Power Trip

Forewarn is introduced in Gen 4: