the same thing it did in all of the pokemon games, brave nature is one of four beneficial natures towards attack so it can get higher as a max number in comparison to all the others.
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One opinion believes that his Charizard's nature is Rash, Squirtle's nature is bold, Bulbasaur's nature is Lonely, Pidgeotto's nature is Brave, Lapras is Serious and Pikachu is Bashful however another opinion is that both Charizard and Pikachu are Rash, Bulbasaur is Serious, Pidgeotto (also Pidgeot) is Brave, Totodile is Jolly, Chikorita (and Bayleef) is Mild, Noibat and Noivern is Timid, Primeape is Rash, Oshawott is Rash, Snivy is Serious and Gible along with Oshawott are both Impish.
Brave Bird is not a TM in the game. Some Pokemon, mostly Flying-type Pokemon, can learn the move by level up and/or by breeding.
The best nature is the Beneficial Nature. It's really hard to get. None of my Pokemon have the Beneficial Nature.
Brave Bird has never been a TM.
Staraptor learns Brave Bird at Level 49.