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ITT: Work out the best dual types for every type in the game.
Essentally, what combinations help negate weaknesses/hit more types super-effectively, etc.
Bonus points: If the type currently does not exist, design a Pokemon based around that type.
Feel free to use Abilities in your reasoning, but if you do, the ability has to be somewhat likely.
To kick things off:
>Grass/Rock
Only repped by the Cradily line, but I think the combination of two generally undervalued types creates something better than the sum of its parts.
Rock covers Grass' Fire and Flying weakness, and is SE against Ice and Bug.
Grass negates Rock's Water, Grass and Ground weaknesses.
This combination, however, only resists Normal and Electric, while still being weak to Ice Bug (somewhat covered by Rock STAB), Fighting and Ground (the latter somewhat covered by the Grass STAB).
Any better combinations for these types? Got any of your own?