Talk:Melmetal/@comment-31423612-20181124201632/@comment-29203151-20181126142146

That is because, ever since Deoxys was introduced, Niantic added an `isTransferable` attribute to each Pokémon. This made it so that Pokémon of the Legendary and Mythical rarities could be transferred if allowed. Soon after, they added a `isDeployable` attribute to allow certain Legendary and Mythical Pokémon to be deployed to gyms.

Please see:


 * Current GAME_MASTER
 * Historical GAME_MASTER