You shouldn't have to do anything because Flareon will like Ditto, they're breeding compatible so they'll breed but breeding for them to lay a Pokémon Egg will just take awhile if they have the same original trainer however if they have different Original Trainers then the breeding for an Egg will be a lot faster.
Yes.
Yes, any of Eevee's evolutions and a ditto can be bred for an Eevee egg.
you will get an eevee because a flarion is the grown up version of eevee
about two or four days.
Ditto can breed with any pokemon. ( except legendaries) Hope this helped! :D
ditto, female eevee, flareon, jolteon, or vaporeon
Either a boy vaporeon,flareon,or jolteon and a girl vaporeon,flareon, or jolteon. Or breed it with a ditto
It doesnt evolve genius
You can't preevolve Pokemon so you if you want another evee breed flareon with ditto, or if the flareon is a female you could breed it with another Pokemon, as long as they are from the same egg group.
ditto doesnt evolve he\she can only transform in battle when the battle is over he\she will transform back
you can make a baby eevee by leaving it with ditto, leafeon, glaceon, jolteon, flareon, vaporean, espeon, or umbreon
yes if the the poliwhirl doesnt need a special item with another poliwhirl it can make a poliwag with a ditto