The Perfect Match-Egg Results
Check a male and a female Pokemon into the day care- you definitely won't get an egg out of the pairing otherwise. As soon as you check them in, speak to the man who tends the day-care park outside. He'll tell you whether the pair of Pokemon is likely to have an egg. If it is, return to the day-care later. If he's standing outside the park, he's got an egg for you. If he says, "They're very friendly..." it's extremely likely that your Pokemon will have an egg. If he says, "The two seem to get along..." That means it's somewhat likely that they'll have an egg. If he says, "The two don't seem to like each other..." That means it's not very likely for them to have an egg. And last, if he says, "The two prefer to play with other Pokemon..." If he says that, there's no way they'll make eggs.
More tricks, tips and cheats for this game are right here - Pokemon Emerald cheats