POWER BOOSTER
Location: Oerba 400AF Beach Area
Enemy: Grenade
VITALITY ORB
Location: Academia 500AF Anywhere
Enemy: Miquiztli
Or you can just spend a few Gil at the shop for the Orbs. Easier than farming Miquiztli.
VITALITY CHIP
Location: Archylte Steppe ???AF Cloudy Grave Ridge
Enemy: Pulsework Gladiator
MANA ESSENCE
Location: Archylte Steppe ???AF Sunny Clearwater Marshes
Enemy: Gancanagh
That should help.