Gragas & Graves Synergy
Gragas Top and Graves Jungle win 50.4% of 1,093 Low Elo games together, +1.0 points vs expected, 2-patch window 26.19-26.20.
Researched on LoL patch 26.20. Tips are written to hold at any rank; stats come from Low Elo ranked games up to patch 26.20.
Why this duo works
Gragas's Body Slam(E) supplies the hard crowd control Graves lacks, holding a target in place for Graves to follow with his damage. Graves players specifically recommend hard-CC allies because he cannot lock a target down himself.
Measured in High Elo: this duo wins 1.9pp more often than expected over 1,166 games.
Playing the duo
Body Slam(E) stuns the first enemy it collides with and nearby enemies, giving Graves a window to land his close-range attacks and abilities.
How to play as Gragas
When Graves arrives for a gank, use Body Slam(E) to stun the target before he commits his close-range damage; aim to collide with the champion rather than a minion.
How to play as Graves
Let Gragas start with Body Slam(E), then follow while the target is stunned instead of spending Quickdraw(E) to force the engage yourself.
Sources
These notes come from r/GravesMains, checked against the champions' abilities.