So... you have a Legend pony, and you want to know how it will breed?
Well, this thread should answer all of your questions!
First of all, Legends are very special ponies, filled with magic and wonder~! They are capable of producing babies of just about ANY OTHER pony species out there! O:
However, what species a particular Legend will produce is based upon what 'type' of Legend you have. As such... here is the breakdown...

Well, this thread should answer all of your questions!
First of all, Legends are very special ponies, filled with magic and wonder~! They are capable of producing babies of just about ANY OTHER pony species out there! O:
However, what species a particular Legend will produce is based upon what 'type' of Legend you have. As such... here is the breakdown...

Dream Legend:
5% - Dream Legend (will go from baby-adult as Earth pony, then grow again)
20% - Earth
20% - Sea pony
15% - Unicorn
15% - Flutter
15% - Pegasus
5% - Seryph
5% - Kirin
5% - Mer pony
5% - Random (any of the species not listed above - colorist choice!)
Nightmare:
5% - Nightmare Legend (will go from baby-adult as Earth pony, then grow again)
20% - Earth
5% - Dragon
15% - Mummy
20% - Demon
20% - Vampire
5% - Seryph
5% - Kirin
5% - Random (any of the species not listed above - colorist choice!)

FAQ:
Q - Can Legends breed together? What about the different types?
A - Yes, and no. Yes Legends can breed together but Dreams and Nightmares cannot, since they are fundamentally opposites. In a Legend x Legend breeding, the rolling would be done exactly the same as described above.

Example!!
Nightmare x Dragon breeding....
Say percentages for the Legend are like so:
1-5 = Nightmare Legend
6-20 = Earth
21-30 = Dragon
31-50 = Mummy
51-70 = Demon
71-90 = Vampire
91-95 = Seryph
95-100 = choice
These CAN be different for different colorists, it's up to you guys exactly how you divide the numbers out. I just know that it all adds up to 100, which is why I did things like this XD
The formula is now like the the breeding formula for the other ponys. Using the same species as listed above for each type of Legend. If you're breeding two Legends you would randomize 1-100 for each baby and the baby will be the species where it lands.
For a Legend and another species you would randomize 1-150, with the extra 50% being the other pony's species added in.