|Master all 12 types of magic materia||Chapter 13||MP Absorption Materia|
You'll be able to receive this Battle Intel once you reach Chadley in Chapter 13 and it's unlikely you'll get anywhere close to completing this before you gain access to Chapter Select after beating the game.
For one, you won't even have access to every magic Materia (green orbs) until later in Chapter 14. The second issue is the Revival Materia needs 5000 AP to master, unless you grind excessively with AP Up Materia on, you won't get anywhere close to this. The reason why it's best to wait for Chapter Select is because the AP rate is boosted x3 making it a lot easier and quicker to master all of the materia needed.
A good way to gain AP once you reach Chapter Select is to replay the Mayor Is Best battle in the Combat Sim in Chapter 17 on Easy mode. With Magnify-Lightning on Aerith, you can end the battle in around 10-15 seconds for bundles of AP and you can replay the battle without having to leave the Sim. Alternatively, you can replay the garage section at the start of Chapter 16, there are many enemies here and clearing them out will offer lots of AP.
|Materia||Where to Obtain (Ch.13 onwards)||AP To Master|
|Wind||Chadley (complete Battle Intel 02)||1200|
|Time||Complete the Missing Children Side Quest in Chapter 14||1200|