It depends if it has space for two or more Pokemon.
I have FireRed but I can't be bothered to check. If so then you can breed by getting a Ditto and another Pokemon or two same Pokemon with opposite genders.
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Bottom of Cerulean City
The daycare center is in a house on Route 5, south of Cerulean City and near the bottom of the series of ledges.
If you mean BREED Pokemon in Pokemon white, you put a girl and boy of the same Pokemon in daycare, and you will later get an egg from the daycare people.
You will need to place Ditto in the Daycare first, then place Claydol with it to breed it.
Put a male and female Pokemon( must be same Pokemon) in the day care together. Or put a ditto and the Pokemon you want to breed in the daycare.