What's your greatest secret/strategy in Final Fantasy?

Well, share something, which you think is not very well-known yet in Final Fantasy (gameplay-wise) like tricks or strategies you have.

Personally, I know so many gamers afraid to fight Yans in Finla Fantasy IX. These guys provides the best source of experience in FF9 and are quite deadly for an unprepared party, but I've got quite a good trick in beating them. Two 9999 damage will kill them and here's a list of attacks that can do 9999 to them:

Zidane - Thievery
Vivi - Doomsday
Garnet - Atomos
Steiner - Darkness and Shock
Freya - Dragon Crest
Amarant - ? try throwing any strong weapons
Eiko - ? try Madeen

I wont tell any secret of mine, i'll keep it for myself. As for strategies, i have one in FFXII. The deep part of the Henne Mines is a good place to level up but its filled with strong monster. These are the gambits i used whenever i go there to level up.

    Ashe (party leader): Durandal,Demon Shield,Maximillian,Bubble Belt

1. Arise - Any Ally
2. Curaja - HP below 30%
3. Faith - Self
4. Esuna - Any ally
5. Libra - Self
6. Float - Any ally
7. Scathe - any nearby enemies
8. Berserk - Member 1 HP below 50%
9. Bravery - Member 2

     Member 1: Exalibur,Maximillian,Bubble belt

1. Curaga - HP below 30%
2. Arise - Any Ally
3. Bravery - Self
4. Esuna - Any ally
5. Protect - Self
6. Shell -Self
7. Attack nearest enemy

     Member 2: Sagitarius/Fomalhault,Maximillian,Bubble Belt

1. Curaga - HP Below 30%
2. Arise - Any ally
3. Berserk -self
4. Protectga - Any ally
5. Decoy -self
6. Reverse -Party Leader
7. Attack nearest enemy - telekinesis