Slaying enemies - fastest way?

[Hikaro Takayama]

Use either the enemy skill Beta, Trine, or Aqualung (all those use realatively little MP and hit all enemies with max whatever element they are damage). Alternatively, you can Equip charachters with a high hit rate weapon (like Vincent's Sniper CR which has a 100% chance to hit) and the Deathblow materia (With a 100% chance to hit weapon, you'll now have a 50% chance of hitting for double damage). Also, any offensive magic materia + all materia works pretty good, especially if you've leveled the materia up.

As for high monster areas (with easy to defeat monsters) hitch a ride on the cargo ship back to Junon and wander around the forest and beach outside of Junon, where a ton of Capparwires appear in random battles, and they only have about 300 hp each. The Mt. Corel Reactor is also a good place to go for lots of encounters.