Pokemon Missing duo-types?

[Darkness Pokemon Master]

heracross is bug/fighting, not grass/fighting.

 

[Light Venusaur]

Also we do have Grass/Ground.
It's the D/P grass starter's 2nd & Final stage. (Look @ Mewthree's trainer card)

 

[PMJ]

None of those types are on my updated list.

 

[pungtuckweng]

Aranus: 1 plate, 1 type.
Eg. Since it can only hold 1 plate at a time, it can only be 1 pure type at a time.

 

[PMJ]

Aruseus with no plates is Normal, so he doesn't really count as being every type.