If you mean fastest breeder, it would be magikarp. If you want it for strength, then breed a Pokemon that is known for being strong, and look for the IV's. (if you don't know what IV's are, look on serebii.net.)
the best way is to buy a game cheat and choose breed faster
I assume you are talking about Pokemon Diamond. If you are, then yes, you can breed Pokemon in Diamond.
Any Pokemon (includingWailord and Azelf).
Yes It Can
walk around
You have to get a manaphy from Pokemon ranger and breed it
you can't unless you have AR
you need a mightyena then breed it
breed a swellow and ditto
You can breed Manaphy with a Ditto to get Phione.
I dont think you can, unless you migrate a swellow or taylow and then breed from them in Pokemon Diamond, Same goes fr Pearl too :) x
you get dialga and have breed it then it unlocks all shinys