well... there is no such as guy with the running shoes in pokemon At all ....
ty for asking
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The gost guy Tim in the haunted manshion
the guy with the black cape[also known as lance]is the Pokemon league champion after you meet him in mahogany town.
he's the tubby guy in the house to the left of the Pokemon center in blackthorn city
If you're talking about the guy from Platinum, he's not in Heart Gold.
Go to goldenrod city and go to the underground tunnel then talk to a guy there and he will give your pokemon a haircut