I know it might sound odd but I would like to nominate a poison/flying typing.
I believe it represents a lot of thing this CAP is trying to achieve.
First its resistant to typed Fighting (4x), Grass(4x), Bug(4x) and Poison(2) while being immune to the everpresent ground type. To balance this out its weak to common type attack suck as Ice(2x), Electric(2X), Psychic(2x) and most importantly Rock(2x) which its usually paired with Ground attacks. This gives it plenty of switch in opportunities but limits its staying power.
It takes passive damage from Stealth Rock, Sandstorm, Hail, Leech seed and is susceptible to burns and paralyzes.
Its stab combination isn't spammable but it offers excellent coverage resisted and immune only by Rock and Steel types. Options such as Brave Bird, Hurricane, Air Slash, Gunk shot and Sludge Bomb/Wave
offer high risk high reward. Furthermore access to support options such as Roost, Toxic, Toxic Spikes, and Whirlwind allow it to act as Pivot in tandem with its resistances.
I feel I have to compare this to Crobat.He has seen some success bar for an underwhelming stat spread, and fullfilled his role decently. I feel that there's yet untapped potential to be found in this type combination.