Skarmory (Steel/Flying) Skarmory is a great Defensive Pokemon because of its stellar base Defense and its type resistances against 10 move types, including Dragon, Fairy, and Flying. A lot of Flying moves in particular are physical based, which Skarmory excels against. Giving Skarmory Roost and preemptively using it against electric moves will remove its weakness to it, while also healing it considerably.
Aegislash (Steel/Ghost) Aegislash is one of the best offensive sweepers in the game, but it also has a number of type advantages. Sacred Sword will shred through Normal type and Iron Head will do the same against Fairies. With regular swaps between Attack and Defense Mode to counter super effective moves, Aegislash can prove to be a formidable foe against all trainers.
Volcarona (Bug/Fire) Bug pokemon in general are underrated, and Volcarona is a great example of one. It is one of only nine Pokemon that can learn Quiver Dance—increases Special Attack, Special Defense, and Speed— and its typing grants it access to strong moves like Fiery Dance or Fire Blast that further compliment a special attack sweeper strategy. Just be careful with its weaknesses: in addition to the water and flying weakness, it takes 4x damage from rock moves!
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