Try being more specific please, but I'll tell you all I know about it, okay? There is two daycares in Pokemon version Firered{don't know if others are the same} and the first is in a city near and underground path that has an old man inside that can care for one of your Pokemon at a time. The more you walk around, the more EXP. points your Pokemon will have, increasing it's level. But the one that I like more is on Four Island where an old man and his wife are, they can raise two at a time, allowing your Pokemon to breed if they are in the same egg groups, compatible, etcetera. For example a female Charizard and male Tyranitar, the baby will always be the female and take the special moves of the male, so a charmander with lets say outrage. Yet there is a small thing you have to do to get the younglings, hatch them, and by walking a bit, so be prepared, but some don't take too long.
~answer from user naturallyinsane
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I think you need a ditto and another Pokemon then give the other Pokemon a master ball then put ditto and the other Pokemon in the daycare center and then take a walk somewhere away from the daycare center and then go back there should be an egg that egg should be the other Pokemon that you put in the daycare and when it hatches it will be holding a master ball. WARNING:THIS MIGHT NOT WORK BUT MY FRIEND TOLD ME IT WORKS
Take them to Four Island after beating the Elite 4. You leave your Pokemon with a Ditto in the daycare and they'll have an egg eventually.
first catch a ditto than breed it with the balbasuar in the daycare in island 8 i think!
Poke breeders are trainers who after deafeting the elite four go to 7 island in firered/leafgreen and putting two Pokemon in the daycare and they have an egg
You can't in the normal region. What's bad is that, but what's good is that later in the game you can travel to 7 islands. On 1 of those islands is a daycare center that can raise 2 pokemon. It's worth the patience.