This is my first build guide on Mobafire, I'm just putting up an APC Sona build guide from many games of experience playing as APC Sona, and successfully carrying games as her and picking up a fair few Sona pentakills.

So there's many Pro's and Con's of playing APC Sona, they can be some of the following:

Pro's:

• Strong in game
• Can single handedly win teamfights
• Its often not expected to have an enemy APC sona, and even if you do destroy their team, most players still opt out of deciding to focus support
• Makes Sona's heal much stronger, so much easier to sustain team-mates in teamfights
• Considered to be quite tanky once Ryali's and RoA is bought

Con's:

• Can often accidentally steal kills
• Not considered to be support
• Can be flamed by team for not "playing support properly"

When playing APC Sona, you need to be fairly confident that you can lane well with you ADC; this is because, when laning as APC Sona, you have a fairly high damage so should aim to peel enemy champions, forcing them back to their tower and away from the creep farm.
The teamwork is important because when peeling the enemy champions, you need ADC who will attempt to grab the kills once the enemies have lost enough before they go to recall.