And do you know exactly which you need?
For me I think there are only 6 more currently available in the game.
KALOS
701 – Hawlucha (Mexico only)
ALOLA
749 – Mudbray
750 – Mudsdale (evolved Mudbray)
764 – Comfey (Hawaii only)
772 – Null
773 – Silvally (evolved Null)
by tmacks26