How to farm AP

[Metagro]

Is there any way to farm AP other than doing the achievements

[Kikss]

you get 25 ap if you complete the virtual gym quest, but thats all i think aside from the achievements where you can get ap 

[Faint]

achievements make it pretty easy to rack up as much AP as you'll ever need

sweet scent plus 5/6 pickup users can get you to 100 pickup items in like half an hour, for example

 

[Elliot Gale]

The AP earned from achievements scales upward almost exponentially after the first few. Just keep chipping away at the things you can do, like walking, hatching eggs, catching pokemon (which in turn fuels the encounter and item usage achievements), etc.

[Lspaceship]

Also the Pickup and Selling Items achivements feed into each other. Pick up items, then sell the ones you won't use.

[Malfeasance]

You can also bag the sell item achievment easily by going to one of the oricorio medows picking up 150 necter and then sell it.