when you get to the city that you bought your bike in, go to the left. not much after you left the city will be a house on the top of the screen, talk 2 the lady, she will ask you for two pokemon. if you want an egg, they have to be one girl and one boy of the same type of pokmon
actually, they don't have to be the same type of pokemon. Try different types and see what you get.Keep in mind this doesn't always work.
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I don't even think you can breed those two pokemon. But if you try it, and something happens, let me know. :p
First you need a magmar leafgreen and Pokemon xd gale of darkness can get magmar trade magmar to ruby then breed it hatch the egg to receive magby.
Breed a female pikachu with any Pokemon from its breeding group or any pickachu with a ditto.
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.
You can trade from Pokemon Ruby to another Pokemon Ruby using a link cable.