You hurt CHarizards feelings.Let's see what would I like to see;
Fire/Ghost
Another Fire/Flying Pokemon (Aside from Ho-Oh and Moltres)
Fire/Grass
Dark/Steel
Dark/Psychic
Dragon/Fire (How is there no Dragon/Fire type)
LOLYou hurt CHarizards feelings.
LOL
Bug/Dragon
Ghost/Electric
Steel/Water
Flying (not a dual type but whatever)
Steel/flying
and that's all I can think of
Most of those have already been done XD
Do they? oh well.