Need certain pokemon for Pokédex Pokémon X version

I require these pokemon to complete my Pokédex:
Magmortar
Electrivire
Porygon2
Porygon-Z
Dusknoir
Thundurus
Landorus
Tornadus
Volcainion
Diance
Jirachi
Genesect if anyone could help I'd really appreciate it :)