It depends on the species of the mother. If the mother is, for example, a Marill, it'll hatch to be a level 5 Marill. (Unless, the Marill is holding a Sea Incense while in the Day Care, the egg will hatch to be Azurill.) Take note that Legendary Pokemon cannot breed.
making the Pokemon like u and have eggs p.s. u have to be eating sceambled pokeeggs
No. Legendaries can't "make eggs".
In Pokemon Sapphire, the only egg you get from an NPC is the Wynaut Egg from the old lady in Lavaridge Town. You can get an egg from any Pokemon that can breed, as with any other Pokemon game that has the Day Care that allows you to leave two Pokemon there. You can breed any Pokemon that can breed with Ditto (except for another Ditto), which can be caught in Pokemon FireRed and LeafGreen and traded to Sapphire.
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.
There is no Pokemon mansion in sapphire.
He is not in Pokemon: Sapphire. You will not be able to find him. He is in Pokemon: Diamond, Pokemon: Pearl, and Pokemon: Platinum. You will definitely have trouble finding him in Pokemon: Sapphire.
Evee is not availiable in Pokemon Sapphire.
Any Pokemon in sapphire but you have to migrate
You will need to walk/run/bike a certain number of steps to hatch the egg.
You cannot get Regigas in Pokemon Sapphire as it is from the next generation of Pokemon
sinnoh Pokemon won't appear in Sapphire version!
All Pokemon in Pokemon sapphire can breed. Except for all legendaries.