Illegal Pokemon

Here is a list of the illegal pokemon:
Arceus
Azelf
Cresselia
Darkrai
Deoxys
Groudon
Heatran
Jirachi
Leafeon
Mothim
Manaphy
Phione
Regigigas
Registeel.
What are illegal pokemon you ask? They are pokemon that you can not get at all (starters and some other pokemon that can not be caught are not illegal, as you can get them), they can only be obtained through trading.