Well to hatch an egg you need to travel around with it until it hatches, but there are faster ways to hatch one. You can battle trainers witch makes the egg hatch faster. I recomend catching a slugma in mt ember and putting it next to your egg in your party then going to celadon and going down cycling road, at the end of cycling road fly back up to celadon and repeat. Each trip takes about 20 seconds and you only have to do it about 9 times. Hope this helped.
walk and walk and walk with ur bike then it will say that the egg is hatching..
and 1more thing the egg must be in ur party..
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Since you can't catch houndour your going to have to trade the Pokemon colosseum houndoom to firered breed it then hatch the egg to get houndour or you can get one from emerald's safari zone.
To get an elekid you have to hatch an electabuzz with a ditto in the daycare and the egg will be an elekidYou cannot find an elekid instead you will need to breed an Electabuzz to recieve an elekid egg hatch it to recieve the elekid.
It's impossible to hatch a BAD egg.
you just have to encounter the Pokemon that is going to hatch out of the egg about 1000 times and if your lucky it'll be a shiny Pokemon hope this helped:)