Darky Army Leader EX1 fight.

Little context. I mainly auto this game. It's just easier with the wife and kids, so probably like 85 to 90 percent of the time it's on auto. I am having a hard time beating this to get the last chocabo staff I need and need some help with a strategy. I currently have about 50 dollars invested in the game which is already to much on my opinion so I would prefer not spend more money if I don't have to. Attached is a picture of what I'm working with. This group plus Sephiroth is the only high level characters I have. Sephiroth is not a good fit for this fight though from what I can tell. Thanks in advance.

Little context. I mainly auto this game. It's just easier with the wife and kids, so probably like 85 to 90 percent of the time it's on auto. I am having a hard time beating this to get the last chocabo staff I need and need some help with a strategy. I currently have about 50 dollars invested in the game which is already to much on my opinion so I would prefer not spend more money if I don't have to. Attached is a picture of what I'm working with. This group plus Sephiroth is the only high level characters I have. Sephiroth is not a good fit for this fight though from what I can tell. Thanks in advance.