What about more than two types? Example: Lugia Psycic/Flying/Water/Dragon
or Multi Type Attacks? Example:Tri Attack changed to Fire/Electric/Ice rather than Normal
Blaze Kick Changed to Fire/Fighting
I agree that Multi Type Attacks would be a good idea e.g. Ice Punch would be Ice/Fighting. It would certainly make match ups far more interesting.
Also how about the "Artificial"
Type, for Pokemon which have been altered by humans, such as Mewtwo / Porygon (2) (Z) / Genosect etc.
This could also be the one type that the Normal
Type have an advantage against as Normal (natural) beats Artificial.