Forewarn shows the opponent's move with the highest power. If two or more moves are of the same power, one will be chosen at random.
In battles with multiple opponents, Forewarn will only show the highest power move out of all the moves known by the opponents. If multiple opponents have a move with the same power, one will be chosen at random. Forewarn can reveal a move of a non-adjacent opponent even if the move wouldn't be able to hit the Pokémon with Forewarn due to being out of range.
If the opposing Pokémon only have status moves, it will still assign one of them.
If the opposing Pokémon is Dynamaxed, it will only assign a move from the Pokémon's base moves.
This Ability effect may be in need of research. Reason:Check the powers assigned to moves without them in Gen V and VI (the list may only be accurate to Gen IV: Hidden Power probably only has a power assigned prior to Gen VI, and other moves are probably assigned 80), is Dragon Energy affected? You can discuss this on the talk page.
While the Pokémon sleeps, items and other Pokémon will be shown on the map of the floor.* The position of Pokémon and items on the floor is displayed on the map while the Pokémon is in the Sleep, Napping, or Nightmare status condition!*