https://gamefaqs.gamespot.com/a/user_image/8/7/8/AANDidAADOg2.jpg
Went in blind and op, lol. Pretty fun fight. Mostly used Tidus/Garnet/Zack.
Crab mech has 2 auras, red and blue. Blue makes it pretty much immune to damage until it does a big aoe attack. Red has an hp poison effect, and will auto kill anyone who drops below 30% hp the second it happens (i.e. doesn't need to get its turn). My team had a lot of healing, but I probably overdid it.
Wing mech also has 2 stances, flying and grounded. I don't know which of the top of my head, but one stance is immune to magic attacks, while the other is immune to physical. So you basically need both types of dps. It also drops a lot of framed debuffs, but I was able to mostly ignore those.
One thing to watch out for if using Zack. When you cross its first hp threshold, the Wing Mech will do a big aoe brv+hp attack on it's next turn. Either wait until after this or until the Crab Mech is in its blue aura to use Zack's BT, because it'll likely bring him to 1 hp, after which the Crab Mech will kill him if it's got it's red aura.
Currently playing: DFFOO, Priconne