|Abilities||Gas, Stop, Tail Laser, W Laser|
Jenova has a huge HP (for this stage of the game) of 4000 but her main attacks don't do too much damage. However, don't get comfortable. She can and will use her laser attacks twice in one turn, so make sure you keep up a high HP as the little numbers add up. Other than that, her only other move to note is Stop. This will freeze your character and can be very annoying so be careful. The only other advice is to use Fire, Bolt and let Cloud get in a few physical attacks. You may also wish to use Choco/Mog and/or Shiva (your first and second summons).
See Also: Bosses (FFVII)