In Ruby/Sapphire/Emerald the chances of cathing a Slakoth is 5%. Just walk around Petalburg Woods for a while, you'll get one eventually.
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Where you get slakoth in Pokemon ruby is in the petalburg woods. Trust me
Slakoth evolves into Vigoroth at level 18.
A slakoth evolves into vigoroth at level 18, then vigoroth evolves into slaking at at level 36.
It depends on the pokemon. The chances of finding it in the wild are 1/8192 (.001220703125%)
level 18