I Just Found Out A Trick To Finish The Quest That Take A Hour Is The Catch 50 Pokemon With A Berry Faster Watch This Video I just made
That is good if you have a ton of Pokémon around you
Otherwise, I recommend giving them Nanabs (and later Pinaps) and not throwing curveballs nor hitting the circle
I rather catch em all than miss out on that one perfect IV Aron. Not to mention, I have plenty berries anyway.