Anything Eater is a boss in Final Fantasy X-2 found in the Ruin Depths optional dungeon and Cloisters 75 to 79 of the Via Infinito, as well as the Fiend Arena. It uses Earth Eater's model from Final Fantasy X.
The normal Anything Eater has access to powerful magic, such as Flare and Osmose, which the oversouled Anything Eater does not. Its spells cannot be reflected because its casts them using its own reflective shield. It has one physical attack.
For its oversouled state, Anything Eater may start picking off party members one by one depending on dressphere. It no longer has Auto-Reflect, but it can dispel the party's Reflect.
One can opt to use brute force, because at this stage of the game an enemy with 36,980 HP and 38 Defense isn't particularly tough, especially when Anything Eater is vulnerable to Slow.
Equipping Tetra Bands, Tetra Guard, or the Tetra Master Garment Grid helps because they either nullify or absorb elemental spells. (Tetra Master needs a round of dressphere changing.) Another option is to employ captured fiends that have already learned or been taught Tetra Eater, like the Black Elemental (unlockable by defeating it in Via Infinito Cloister 40).
If Anything Eater is Oversouled, it is best to avoid having all party members with the same dressphere and to spherechange whenever the message "Me no like dressphere!" appears.
After the player defeats Anything Eater in the Ruin Depths in Chapter 5, they can recruit it into the party with a Trap pod L in the Calm Lands. Anything Eater comes with Ailment Def. and Total Limit Break.
In the Fiend Arena, Anything Eater, while the same as in the Ruin Depths and Via Infinito, has access to Kill Attack, which is an unblockable physical attack that damages a character by their max HP. In addition, it is always paired with a strong Chocobo, as part of the team Today's Friends. These two enemies, paired together, are among the most dangerous enemies in the Chocobo Cup.