Final Fantasy X Earth Eater Monster Arena Battle

Now we are finally getting to the home stretch! We now start with the Original Creations, with our first battle being with Earth Eater. Original Creations are created from fulfilling certain capture conditions. For Earth Eater, simply unlock 2 Area Creations to unlock it. As all the Original Creation battles go, the battle will be a long, hard battle. Earth Eater starts with a Megaton Punch, which is his regular attack and counterattack. Megaton Punch has Deathstrike, which will kill the party member if the damage doesn't kill them outright. And this will basically be a counterattack to everything you do to it, even Stealing from it. After dealing 100,000 HP of damage to it, Earth Eater will fall on it's back. When on it's back, it loses it's armor status, making attacks more damaging. Now instead of countering with Megaton Punch, it counters with a reflected Flare (it has Auto-Reflect), which is still very powerful, but never breaks the damage limit. After 2 of it's turns, it will get back on it's feet, so take advantage of Earth Eater when it's down. Chip away and keep the party healthy and you should be fine, even if the battle is long. Be careful with Magic, as most Magic can be Reflected. Keep in mind, I went around the entire Sphere Grid with everyone before doing these battles, but never added Spheres.
Enjoy!