This is the combo I'm currently using to gain AP near Mideel:

Cloud
Weapon (Apacolypse): Slash-All, (whatever I feel like levelling)
Armor (Rune Armlet): (whatever)
Accessory: Fury Ring

Cid
Weapon (Javelin): (whatever)
Armor (Rune Armlet): (whatever)
Accessory: (who cares?)

Any other character with a weapon that has four double-growth slots for a weapon
Weapon: (whatever)
Armor (Rune Armlet): (whatever)
Accessory: (who cares?)

This'll cause Cloud to automatically attack all enemies, and at level 71 with the Apacolypse, that only takes one hit . The only real reasons to use the Rune Armlet (it is Armlet, right?) instead of the Wizard Bracelet are for better physical defense and to get them MASTERed quicker individually (same goes for weapons with only four 2x growth slots). If them catipillar lookin' things are a trouble with their sleep attack, then give Cloud Seal=Added Effect to his armor, but that'll reduce you by two slots, and you should wear the Wizard Bracelet, which lowers your defense.