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What are some moves, Abilities and types that would go nicely together, but that haven't been combined yet?
I do not mean just unused type combinations or new moves - I mean moves, Abilities and type combinations that already exist, but haven't been put together in some way that would offer some unique potential.
A lot of Mega Evolutions did things like this - Mega Lopunny, for example, has neither a unique type nor a signature Ability (Normal/Fighting debuted in Gen V and Scrappy debuted in Gen IV), but by putting them together, it got then-unique access to perfect neutral coverage with STAB alone. There are also duos that play with some types and Abilities interestingly (Pinsir happened to introduce a new Ability on top of this, but the core idea that Heracross had Skill Link + Rock Blast and was double-weak to Flying while Pinsir had Flying STAB and was double-weak to Rock was possible long before Aerilate, so Aerilate was just icing on the cake).
So yeah - what are some existing moves, Abilities and types that you'd like to see combined? What makes your proposed combination work so well/why is it better than having them individually?