PokéBase - Pokémon Q&A
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Here is a table that lists all of his locations and on what days he appears. Here is a list in case you don't want to click the link:

New Bark Town
Cherrygrove City
Ruins of Alph
Route 32
Slowpoke Well
Ilex Forest
Route 35
National Park
Pokéathlon Dome
Ecruteak City
Route 39
Olivine City
Glitter Lighthouse
Safari Zone Gate
Ice Path
Blackthorn City
Route 45
Route 48
Mt. Silver
Frontier Access
Pallet Town
Route 1
Viridian City
Pewter City
Pewter Museum of Science
Cerulean City
Vermilion City
Silph Co.
Saffron Train Station
Celadon City
Dragon's Den
Celadon Department Store
Fuchsia City
Route 12
Route 14
Seafoam Islands
Route 21
Route 22
Route 26
Goldenrod Department Store
Bellchime Trail
Route 47
Olivine Cafe
Mahogany Den
Diglett's Cave
Route 25
Moomoo Farm
Olivine City Harbor
Cinnabar Island
Victory Road

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Well, he appears in a lot of places, but only after you arrive in Goldenrod.
>After the player arrives in Goldenrod City, Cameron will periodically be found in both Kanto and Johto on varying days of the week, and in a few cases, at different times. He will take pictures of the player's party and the surrounding area. Cameron's house is in Cianwood City, which has an automatic camera beside it for use at all times; however, Cameron cannot be found here.

A full list of his locations can be found here, as well as the source for the above paragraph.