Shen & Yone Synergy
Shen Top and Yone Mid win 55.0% of 2,695 Low Elo games together, +1.6 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
Yone can start a dive with Soul Unbound(E) or Fate Sealed(R), and Shen can shield that commitment with Stand United(R) before arriving for Shadow Dash(E) follow-up. The timing matters: Shen should begin his channel as enemies commit to Yone, while there is still time for the shield to absorb the response.
Playing the duo
Stand United(R) shields an allied Yone while Shen channels, then teleports Shen to Yone's location; this lets Shen follow Soul Unbound(E) or Fate Sealed(R) with Shadow Dash(E) control.
How to play as Shen
Watch Yone's dive and cast Stand United(R) as enemies commit to him, then use Shadow Dash(E) to taunt targets when you arrive; the shield buys time during your channel.
How to play as Yone
Call Shen before committing with Soul Unbound(E) or Fate Sealed(R); Stand United(R) takes time to channel, so give him a chance to shield you before the enemy team collapses.
Sources
These notes come from mobafire.com, checked against the champions' abilities.