PokéBase - Pokémon Q&A
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Johto: National Park (Come 1st in Bug Catching Contest), Route 42 (PokéGear Phonecall)
Kanto: Route 25 (Show Bill's Grandfather a Marill in HG or a Staryu in SS), Seafoam Islands
Shop:
Johto: Pokeathlon Dome

Source: Serebii.net, http://www.serebii.net/heartgoldsoulsilver/items.shtml

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how many points do you need to have to get one
I'm not entirely sure...