League of Legends (LoL) Question: What's the best build for Xayah and Rakan when playing together?

Hi! In my own experience the best build for Rakan right now for most matchups is Relic Shield, Ionian Boots of Lucidity, Shurelya's Battlesong, Zeke's Convergence, Vigilant Wardstone, and Cosmic Drive but you can try more items that adapt your playstyle so you can have more fun playing the game! You can check other options in my Rakan guide if you feel like to

There is no real "synergy" build between these two champions, just exploit their strengths (Rakan utility and Xayah damage)

And about Xayah I can't really tell you a good build since I barely play her in order to recommend something, maybe try her most picked build which is Berserker's Greaves, Galeforce, Essence Reaver, Infinity Edge, Lord Dominik's Regards, and Guardian Angel since as I said before, there is no real "synergy" build between these two