yeah but he is somewhere in......
the Pokemon league not eactly though the island before victory road
then search around there hope this helped
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the hiker is in mt.cornet
To get an underground secret base, you have to go down there and buy it from a hiker who is selling Traps.He should have a Digger Drill for sale.Buy the Drill from him, then use in on any random underground wall, and... BING!Your secret base is born.
The hiker (in Pokemon Diamond, Pearl and Platinum) to find a Happiny will be on Route 210, South Pokemon with Breeder Kahlil.
you go underground and find a hiker he will ask for a trade and if you buy a digger drill you can get a base.NOTE:if you find a fossil bring it to the surface and go to oreburgh and go to the muesum and talk to the guy in a white lab coat THEN go to your PC and deposite on of your Pokemon go to the meusem and talk to him again and boom you got a new Pokemon!!!
Im sorry, but there is no happiny egg in Pokemon platinum. You got diamond or pearl? trade from there