Against sona, Catching Sona out when she goes to ward will allow your team to potentially allow you to take the Baron, Dragon or start a team fight when she is unable to protect her team.

Avoid team fighting in areas where you’re forced to group close together like inside an objective pit or in the jungle. This will allow Sona to get a multiperson Ultimate R. Try and group but not too close together.

A good Sona will be stood near the back of her team when her Flash is down. This will make it harder for you to kill her in a team fight. To make killing her easier, try to flank her from the side or from behind. Against sona, Catching Sona when she goes to the hall will allow your team to allow you to take the Baron, Dragon or start a team fight when she is unable to protect her team. Avoid team fights in areas where you are forced to group together as inside an objective pit or in the jungle. This will allow Sona to get a multi-person Ultimate R. Try and group but not too close together. A good Sona will be standing near the back of her team when her Flash is down. This will make it harder for you to kill her in a team fight. To make her easier, try to flank her side or back.