Slaking made its debut in Love, Petalburg Style!, in which it was staying in Norman's greenhouse with the rest of his Pokémon. It slept through nearly the entire episode.
Later, when Team Rocket destroyed a fireworks machine that Norman was keeping for his wedding anniversary, he flew into a rage and thus summoned Slaking from inside the greenhouse. On Norman's command, it charged at the terrified Team Rocket members and violently sent them blasting off with a powerful Focus Punch.
Norman later used it in the Gymbattle against Ash in Balance of Power, where it was shown to be a powerful fighter. With its brute strength, it almost defeated Ash's Grovyle. However, when Grovyle's Overgrow Ability activated, it managed to gain the upper hand and Slaking was defeated.
Unlike most Slaking, this Slaking appears to be very lively and active. This was shown when Norman called it over in order to send Team Rocket flying and during the Gym battle against Ash's Grovyle.
A † shows that the move was used recently, unless all moves fit this case or there are fewer than five known moves.
In the games
Like in the anime, Slaking is Norman's main Pokémon in the games as well. In Ruby, Sapphire, Omega Ruby, and Alpha Sapphire, as well as the Emerald rematches, he uses two Slaking per battle.
A † shows that the move was used recently, unless all moves fit this case or there are fewer than five known moves.
In the Pokémon Adventures manga
Slaking in Pokémon AdventuresSlaking activating its Truant Ability
Salking first appeared in Brushing Past Breloom, where he was used to find the extra presence that Norman was sensing. Slaking uses Swagger to confuse them, but Ruby was unaffected due to Kiki's Safeguard.
In Hanging Around With Slaking I, Slaking is used to battle Ruby at the Weather Institute, easily overpowering Nana and Kiki. After being attacked from Mumu's Mud Shot, Norman has Slaking power up with Bulk Up. Slaking then rips out the stairs and places it and Ruby over a drop, keeping it stable while Norman talks to Ruby.
