west of eterna city
in Pokemon platinum, you can find slowpoke in the north side of route 205. But, you need to use a pokeradar to find or else its not possible. hope i helped :)
To get Slowpoke is in Eterna City side of Route 205 [use Poke rader]. You need to evolve Slowpoke to lv37.
You have to trade it from platinum, diamond or pearl
Only in Leafgreen, Pearl, and Platinum. Route 205 for Pearl and Platinum, Leafgreen has many.
You have to use the PokeRadar on Route 205
use your pokeradar at route 205 north
you don,t because your person dies
It's the Psychic girl on route 225 who has a Slowbro (you've to battle the psychic girl). In Diamond and Pearl, it even has two Slowbros! In Platinum, she begins with a Slowpoke, and when the Slowpoke is defeated, she'll send in Slowbro.
Use your poke radar on route 205 north.
Level 37 for Slowbro, trade holding a King's Rock for Slowking.
use you're pokeradar between eterna city and the forest [ you will find slowpoke]
Put the King's Rock in the slowpoke.Then,trade it.You will lose the rock and evolve the slowpoke.