Slaking is among the Pokémon in Pokémon GO with the highest defense stat, which means it may be difficult for some players to take down. However, it isn’t invincible and can easily be defeated through Pokémon that know Fighting-type moves, such as Hariyama, as demonstrated in the screenshot above.
Trainers, don’t be intimidated if you see a Slaking defending your neighborhood Gym. Although it has a high CP, Slaking is weak to Fighting-type moves from Pokémon like Hariyama. #PokemonGOtip
Source: @PokemonGoApp