In Red, Blue, Green and Yellow there is no daycare, since there was no genders then, therefore breeding mechanics couldn't work.
In FireRed and Leafgreen there re two daycares. One is just below Cerulean City, however that one can only care for one Pokemon, therefore breeding mechanics can't work there. There is also one on Four Island (in the Sevii Islands) that can store two Pokemon, therefore breeding mechanics can work there.
As for HeartGold and SoulSilver, which can access Kanto, is just under Goldenrod City.
Hope I helped. :)