Reshiram
>Flames spew from its tail as it flies through the sky like a jet airplane. It’s said that this Pokémon will scorch the world.
According to myth, if people ignore truth and let themselves become consumed by greed, Reshiram will arrive to burn their kingdoms down.
Zekrom
>When the interior part of its tail spins like a motor, Zekrom can generate many bolts of lightning to blast its surroundings.
Mythology tells us that if people lose the righteousness in their hearts, their kingdoms will be razed by Zekrom’s lightning.
Kyurem
>Dwelling within it is a power even greater than that of Reshiram or Zekrom, but the extreme cold keeps that power bound.
It appears that this Pokémon uses its powers over ice to freeze its own body in order to stabilize its cellular structure.
White Kyurem
>The sameness of Reshiram’s and Kyurem’s genes allowed Kyurem to absorb Reshiram. Kyurem can now use the power of both fire and ice.
It has foreseen that a world of truth will arrive for people and Pokémon. It strives to protect that future.
Black Kyurem
>It’s said that this Pokémon battles in order to protect the ideal world that will exist in the future for people and Pokémon.
The sameness of Zekrom’s and Kyurem’s genes allowed Kyurem to absorb Zekrom. Kyurem can now use the power of both electricity and ice.

Is there any Legendary trio that's more based?