@Power Play
I farm for gems mostly in scoot’s 2nd challenge, I know there’s big mac’s but I can do the first one a lot faster despite the fact that it has 1 chest less. Mostly since I’ve had terrible luck and the best amount I usually get are 2 gems at best.

Sorry if that sounds too long.

After 4 hours playing the game, I(kind of) have some tips:

1. Getting most amount of gems just by completing the challenges: after completing a challenge for the fisrt time, you will recieve some gems and have the option to get 50% more by watching an ad. The ads are important and the trick here is to complete the previous challenges that you have already done AT LEAST twice. Why? Renember when I said you would get 50% more and atm the percentages are stacked(75% max)and therefore right after you finsish it fisrt time, the stacked percentage are saved.
2. The second-half in the “court yard?”: the challenges in that phase are TEDIOUS if you are using the common ponies, I suggest you should use ponies from rare or above.
3. Making life easier: Renember the fisrt one? Well, if you’re following it correctly, you would get a hansome amount of gems. The best way is to use it to get the highest tier ponies because all of them are started at lvl. 30 and have impressive amount of projectiles and damage ESPECIALY when you reach to the theatre or 50% complete. When you manage to get there then common ponies are pretty much irrelevant.

I’m haven’t fully completed the game yet so replied if I got anyting wrong or misleading.

1. Getting most amount of gems just by completing the challenges: after completing a challenge for the fisrt time, you will recieve some gems and have the option to get 50% more by watching an ad. The ads are important and the trick here is to complete the previous challenges that you have already done AT LEAST twice. Why? Renember when I said you would get 50% more and atm the percentages are stacked(75% max)and therefore right after you finsish it fisrt time, the stacked percentage are saved.  
2. The second-half in the “court yard?”: the challenges in that phase are TEDIOUS if you are using the common ponies, I suggest you should use ponies from rare or above.  
3. Making life easier: Renember the fisrt one? Well, if you’re following it correctly, you would get a hansome amount of gems. The best way is to use it to get the highest tier ponies because all of them are started at lvl. 30 and have impressive amount of projectiles and damage ESPECIALY when you reach to the theatre or 50% complete. When you manage to get there then common ponies are pretty much irrelevant.
    
   I’m haven’t fully completed the game yet so replied if I got anyting wrong or misleading.