Just trade Pokemon with them and then if they get to the man where you make groups they can join your group when they talking to him they can see the groups.
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by trading or cheating with an action replay-if you already have one you can also breed with a Pokemon of the same egg group to get another
yes just breed a female piplup, prinplup, or empoleon with another male Pokemon in its breeding group. I think they are group Water 1 so bidoof, buizel, marill and others can be breed with it to make piplulp eggs
Pokemon in the same egg-group as gardevoir
Clefairy's Egg Group is Fairy, so any Pokemon with the same Egg Group can breed with Clefairy, including Ditto, which has its own Egg Group.
Unfortunately you cannot breed Flygon with any other Dragon-type Pokemon. It is the only Dragon Pokemon that can breed that is not in the Dragon egg group; instead, it is in the Bug egg group and can breed with other Bug-type Pokemon.