I asked this a while ago but I still don't understand completely. From research, here's what I've gathered so far on how to make this work.
-I need a Male Gyarados and a Female Dragonair.
-The Male Gyarados must know Dragon Dance. (I'm going to delete off all of the other moves on Gyarados just in-case. I'll also delete all the moves off of Dragonair except for one.)
-I need to Put them both into the Daycare and then they will produce an egg. Since Gyarados is the father, his moves will have had passed down to the egg, making the Dratini have Dragon Dance.
Please explain thoroughly if that is wrong.
Now onto the nature, the confusing part for me.
Is there an item or something I can give to Gyarados to ensure that the egg will be Adamant Nature? I don't want to hatch 20 eggs just randomly trying to get it... I heard an Everstone would do the trick, but apparently that only works in Emerald, which I don't have access to. If the Gyarados was Adamant Natured, would the nature then pass to the egg?
Edit: Cmon someone reply please!