I decided to make this thread since the last ball formation thread hasn't had a post in it in months, and the general AC Venom thread has absolutely nothing listed under ball formations. If you feel anything is missing then please post up, I want this post to be as thorough as possible.
How it works:
Venom Can summon up to five balls, each indicated by the five attack buttons (P, K, S, HS, and D). There are five different ball formations each corresponding to a different attack button. All of your current balls on screen will change to the formation of the last ball you summoned. This means that a formation of D>HS>S>K>P is the exact same thing as K>S>HS>D>P since they both end with P, thus making them go into the P formation. Also note that each ball has a designated spot in each formation, this means that the K ball will always be in the exact same spot whenever it's in the P formation. Here is a sheet showing all five ball formations, and where each ball is specifically located in them:
Useful ball formations:
Note: You shouldn't be trying to summon more than 3 balls in a setup, because they take to much time to build, and you can make equally strong formations with just 3 or less.