When he lifts all his tentacles and crashes them down onto the ground (in his first phase), there is a way to easily avoid this attack without having to run around like a chicken with your head cut off to dodge it: simply run as close to the tentacle as possible (towards the center, of course, where Octo Diablo is), and the tentacle will not be able to hit you. For various reasons, I'm assuming this is because the tentacle is more like a "partisan" attack, and cannot hit things DIRECTLY in front of it, but has a wide area further away, where the tentacle touches the ground and causes damage.
Just had to say it somewhere where others might see it and try for themselves, I dunno, maybe it was just me, but the moment I noticed it happen, with no "miss" yet I was unscathed, I tried it about 5 times, all the same results. Hope this helps some of the newer people beat that pesky Octo Devil. ^_^
Also, if you open your item menu while you're being sucked into his mouth, before you're actually in it being chewed, you can be able to use Mates and stuff to heal yourself while he's gnawing on your skull. Just another neat little trick.
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