Gain increasing amounts of AD or AP, Adaptive over the course of the game.
Offense
+9% Attack Speed
Flex
+5 AD or 9 AP
Defense
+6 Armor
WhyFleet Footwork
Fleet Footwork provides great jungle sustain as you clear as well as a burst of Movement Speed for kiting in duels/invades.
WhyTriumph
Triumph's massive heal is great when paired with natural bruiser-ness of Graves so you can keep fighting and pump out damage.
WhyLegend: Alacrity
The extra little bit of Attack Speed on graves is nice for a faster jungle clear and being able to reload slightly faster.
WhyCoup De Grace
Coup De Grace's execution damage is great for looking to explode enemy squishy champions on ganks.
WhyAbsolute Focus
Absolute Focus grants you a ton of additional AD for a quick jungle clear. You should be able to easily stay healthy enough to keep this active with Fleet Footwork.
WhyGathering Storm
Gathering Storm helps to patch up one of graves weaknesses, late game. The extra Attack Damage can make you a seriously teamfight threat as a second AD Carry in long games.