If you're trying to do Thousand Maws of Toto-rak, it's not required in order to rank up and get your Chocobo.

If you're having trouble with the Golem NM, don't forget that the NPC gave you an item to use that weakens its attack and defense by a lot (you can use it with the icon in the main menu or the micro menu that looks like a little scroll, make sure you are targeting the golem and within range of it). Also try getting level 26, Stoneskin will help you a LOT.

Sorry if this isn't the problem you're having, this is just the stuff I've seen people get tripped up on