You can't. You have to catch a slakoth in the petalburg woods and evolve it.
In Pokemon Ruby, Vigoroth will evolve into Slaking at level 36.
Get a Slakoth and train it to level 18, then it will evolve into Vigoroth. If you want Slaking, train Vigoroth to level 36. Enjoy =D
lvl. 18 to Vigoroth lvl. 36 to Slaking
a normal type gym. he will use two slaking and one vigoroth.
two slaking and a vigoroth your best off using fighting types for this gym
Vigoroth is a Normal type pokemon.
If you mean Slakoth: Slakoth evolves into Vigoroth at level 18, who evolves into Slaking at level 36.
Pokemon ruby's version IS Pokemon ruby.
You'll need to evolve Vigoroth to get it or trade.
Vigoroth evolves at Level 36.
Vigoroth will evolve at level 36.
Vigoroth evolves from Slakoth at level 18 in Pokemon Emerald. Vigoroth is a very robust normal type Pokemon with good speeds stats. Vigoroth evolves in to Slaking at level 36.It evolves at level 18.