Unfortunately, you can't.
~MoNgOoSe
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You can catch Slowpoke in Pokemon Gold in the Slowpoke Well that is by Azalea Town and you can also find them in Tohjo Falls.
You can catch it in Slowpoke Well. That's the only location I can remember.
Slowpoke cannot be caught in Pokemon Diamond. This Pokemon can be found on route 205 in Pokemon Pearl using the pokemon radar and traded to Diamond.
level 37
You have to use the PokeRadar on Route 205