Skarmory, the Armor Bird Pokémon. Because Skarmory nests in briers and is constantly scratched by thorns, its wings become razor sharp.
– Ash’s Pokedex
Skarmory has a unique typing of Steel/Flying. I like the type combination, because Steel and Flying offset many of each other’s weaknesses, leaving it only weak to two types. Its Steel type and high Defense stat makes it a good defensive wall. Appearance-wise, Skarmory looks like a predatory bird. Its wings look like separate flaps, which makes me wonder if it can even fly, despite its Pokedex entries saying how it can fly at 180mph.
Skarmory can get the best moves in Gen IV, where it can learn Stealth Rock by TM. But Stealth Rock is no longer a TM in Gen V, so it has to be chain-bred. It can learn Roost and Whirlwind as well, which makes it work well as a Defensive type.