[FFIII][idea] After you beat the Djinn...

[Perdedor]

Become a team of Monks. Change jobs only when you need to change forms or such to proceed.

Why? They have untapped potential in the beginning of the game. Terrific stats, HP growth, and...

Without weapons, they shine. I have a level 23 all-around Monk team with the attack stats in 200+. With every job level they gain, the attack strength gains two points. Just don't equip anything. I was dealing 2,000+ damage per attack on Hein, killing him in one turn.

Until you get Black Belt, this is the way to go.

To keep up defense, sail around to the Village of the Ancients, buy Headbands and Kenpo Gis.

Good luck.

[-_Ingus_-]

Maybe I'll try this, but it sounds like it will be boring...

[CloudFF]

yeah i agree all the same class would be easy but really boring compared to a variety and a challenge

[Raines]

I do tend to keep one character as a monk untill the last crystal, but a high level healer is still good use to have.
And like what's been said above, four of the same class isn't all that fun. Unless you are challenging yourself with particularly hard classes, say four freelancers or the likes. And even then it's kind of pointless.
Obviously some classes are stronger than others overall but there's a bunch of different classes might aswell use them all.