To beat Diablos easily in FF8 at horribly low level:
Junction blind to squalls weapon, blind the [censored], and just remember the gravija and demi cant kill you. You CAN cast demi on him too if you feel like hastening the process, but just have a phoenix down or two on backup incase you dont blind him.
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Call it aftermath, She's turning blue, such a lovely color for you.
----Self Proclaimed FF Guru----
--Self Proclaimed Metal Guru--