Rakan Runes explained
There's one set of runes for Rakan on patch 15.12 that is the clear favorite for LoL players and pros alike. The best Rakan rune paths on the position 
Support are 
Resolve as the primary path and 
Domination as the secondary path with a pick rate of 70%. Besides picking runes on Rakan you should learn how to play Rakan and if you are interested in pro matches take a look on how a pro builds Rakan. If you want to discuss 
Rakan then you should visit the champion subreddit.
Rakan runes from primary path
Resolve empowers the survivability of Rakan and increases the tankiness. Most of high elo players – and our LoL pros in the the major regions – have agreed that 
Guardian is the best keystone rune to run on Rakan. This keystone rune grants a shield to your teammate and towards your own, as soon as one of you gets damage by an enemy champion. Other primary runes on Rakan are 
Font of Life, 
Bone Plating and 
Unflinching.
Font of Life provides your teammates with more sustain by healing them whenever they attack a champion whose movement you've recently impaired. Bone Plating make Rakan overall tankier, by decreasing the amount of poke damage in the early game. Unflinching inceases Rakan tenacity based on your missing health.
Rakan runes from secondary path
When it comes to your secondary path, most Rakan players prefer to go with Domination. Domination improves burst damage and assassination tools on Rakan. On the Domination path, the best runes for Rakan are 
Deep Ward and 
Ultimate Hunter.
Ultimate Hunter scales up Rakan ultimate haste on every unique champion takedown.
FAQ for Rakan Runes
Which is the best keystone rune on Rakan?
The best keystone rune on Rakan is Guardian. This Rakan runes setup is then referred as Rakan Guardian.
What runes does Rakan use?
Runes from the paths Resolve and Domination are the most used runes on Rakan. For the exact pick rates of Rakan runes used, you have to study the rune distribution presented.