Go to gamesfaqs.com and then type in Pokemon diamond and you will see the button FAq and when you get to that page, click rthe first one
finish eterna gym and go inside galactic eterna builiding and save the bikeshop owner then go into the bike shop and talk to him he will give you a bike as a gift for saving him by poke master Rydhan
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I never saw a wild Stunky in Platinum, but I have in Diamond in the grass under the bicycle road.
Pokemon diamond
Actually, you go beneath bicycle road and in the middle of underneath it, run and you will go through an invisible cave and it will be somewhere in there
you cant be a Pokemon in Pokemon diamond