Stickers are collected in AR Mode, so it's only fair that you can unlock new stuff for AR Mode. Both AR and Photo Stickers are counted together, so don't think you have to reach one sides number or the other to get the unlockable.
|Unlockable||How to unlock|
|Hear Pokemon's Cry in AR Mode||25 Stickers|
|Incorporate Saved Pictures in AR Mode||50 Stickers|
|Use up to Nine Pokemon in AR Mode||70 Stickers|
|Slider in Scale Settings Can Now Be Used||100 Stickers|
|Stopwatch in AR Mode Can Be Used||150 Stickers|
To get the AR Stickers, all you need to do is scan a QR code of a pokemon stored in your pokedex.
To get the Photo Stickers, make sure you can see the pokemon straight on, so its whole front is facing you.