>>48192008>>48197218Mainly power, rarity, and myth. We already know that they are meant to be more powerful than your average pokemon (please don't start shit with competitive play) as well as the fact they are both extremely rare and they have myth/lore behind them.
Look at the Tao trio. Reshiram, Zekrom, and Kyurem are all powerful pokemon, especially on how the characters talk about how Reshiram and Zekrom are powerful enough to destroy the world. There is only one of them since the lore talk about there was the original dragon splitting into two meaning they are very rare. And finally the myth and lore about them helping create Unova and how the war nearing destroy the land.
The real issue here is that Gamefreak just gave up on these three when making some of the legendary and said "Fuck it, let's call it a day". Urshifu is an example. How is it a legendary when it can breed and there was abundant of them before. That's not some legendary pokemon, it's just some creature on the endangered species list. What
>>48191940 said it right, just so you can't breed it.
