Zekrom is a DragonElectric-typeLegendaryPokémon introduced in Generation V. It is also known as the 'Deep Black Pokémon'. Along with Reshiram and Kyurem, it is a member of the Tao trio.
How to Obtain
With any Electric-type Pokémon and Kyurem in your party, enter the Mausoleum and search in any patches of grass. You must have at least 8 badges in order for this to work. You can also obtain it by redeeming the code "Positivity". (Please note that the code has expired).