He is east of Fuchsia City, in the gaurd house separating route 15 from the city. Go up the stairs, and you will find his aide.
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In the big building either it's west of celadon city or fuchsia city but there is a prof oak aide inside on the top floor and he gives you the amulet coin if you have registered 40 Pokemon in the pokedex.
He's not in firered only in gold, silver, crystal, heartgold and soulsilver.
Go to Pokemon tower in Lavender town and go up to where Mr Fuji was standing (between the two pillars, you MUST stand between them) and then use the itemfinder that prof. Oaks aide gave you. It will be underneath your feet.
Pallet Town. At Prof Oak House. Second Floor. To the left
Route 225 is not a route that can be found in Pokemon Firered, route 225 is in Pokemon Diamond, Pearl, and Platinum. To get there is Diamond Pearl and Platinum, you have to see every Pokemon in Sinnoh, then talk to Prof. Rowan and get the national dex.