MORE TRIVIA TIME!!!
In double and triple battles, one can nullify Slaking’s Truant ability by using either Skill Swap or Gastro Acid. Several Trainers in Pokémon Emerald use this power, including Norman during the player’s rematches with him. Cipher Head Evice is the very first Trainer in any game to use this tactic. Without Truant, Slaking can make full use of its impressive stats. This can also be done in single battles by using a contact move on a Pokémon with Mummy. Despite its Pokédex entries saying that it is saving energy for striking back, it is no less powerful without its ability.
art by Paul Robertson