The 5th gen introduced alot of unique dual-types never seen before in the last 4 gens. But there are still alot of dual-types that haven't existed yet.
Some come to mind:
Grass/Ghost
Fire/Poison
Water/Fire
Rock/Dragon
Electric/Psychic
What other types would you have liked to have seen or will see in the future?
grass ghost is about the only one i'd like to see ,i mean think about it ,a fire and water pokemon what would it's move be
*pokemon used bubblebeam*
*pokemon ability kicks in, negates the effect of water moves*
-_- it would be a new magikarp
grass can die therefore i would like to see grass /ghost pokes ,and a dragon rock will be a hard one to get creative on too
but i think more dragons are needed ,and less dragon/flying there's so blooming many of them (don't get me wrong i like dragonite and altaria etc but there's still to many flying/dragon)
electric psychic is a little weird too ,but i suppose it could work fire poison seriously -_-'
just had a idea how about a dragon fossil in the future gen now that would be cool