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Every second turn, a Pokémon with Truant cannot use a move due to loafing around, such that the Pokémon can move on its first turn but not its second turn. Switching out or gaining the Ability Truant resets the turn count for Truant. Using an item does not count as a turn for the purposes of Truant. In Generation V, Truant is reset by sleep and a Pokémon with Truant will always be able to attack on the turn it wakes up.
Moves with a charging turn, such as Fly, will not work (unless the user is holding a Power Herb), because the turn in which the move would be executed is the same turn in which the Pokémon will be truant. If the Pokémon uses a move that requires recharging, such as Hyper Beam, then the Pokémon will loaf around due to Truant during the turn that would normally be used recharging; however, the Pokémon is still committed to recharge, and thus can neither use items nor switch out on that turn.
If a Pokémon gains Truant after it calls upon Mega Evolution, Ultra Burst, or Dynamax at the beginning of a turn, but before it moves that turn, Truant will activate on its first attempt to move.
If a Pokémon with Truant uses a move and is then Instructed to use the move again, the Pokémon will loaf around instead of executing that move. Then, in the next turn, the Pokémon with Truant will be able to use a move normally.
In Pokémon Super Mystery Dungeon, Truant instead causes the truant status condition for one turn. Unlike the previous Paused status, the truant status only prevents the Pokémon from using moves and allows the use of items. Truant additionally can inflict the Yawning status condition on all surrounding enemies when the Pokémon with the Ability Truant is asleep.
When the Pokémon uses a move, it will get the truant status condition! Also, if an enemy Pokémon is next to the sleeping Pokémon with this Ability, it will get the yawning status condition!
When the Pokémon uses a move, it will get the Truant condition. Also, if an enemy Pokémon is next to a sleeping Pokémon with this Ability, the enemy will sometimes get the Yawning condition.
In the anime
A Trainer's Slaking
Sawyer's Slaking
The Pokémon occasionally becomes too lazy to attack during battle.