Don Tonberry ( Final Fantasy X ) Don Tonberry is an optional monster from " Final Fantasy X " . He is bred in the Area Conquest section of the Monster Arena after at least one of each fiend in the Cavern of the Stolen Fayth is captured . Battle . Don ' s attacks are identical to those of the regular Tonberry and Master Tonberry , although they do much greater damage . He counters every attack with a strong Karma , and on each turn takes a step forward . After taking five steps he will randomly attack a party member with Chef ' s Knife , which can be an instant kill . If an aeon is summoned , Don Tonberry will perform Voodoo where he generates a tiny image of the aeon and stabs it for heavy magical damage ; this attack ignores Shell and can be only reduced by Focus and the Shield command . Damage for Karma is calculated the following way : Don Tonberry will drop weapons with status strikes and armor with status proofs , the Instant Death versions of these abilities being fixed . Its equipment drops provide a 6 % critical hit chance bonus instead of the usual 3 % ( this is relevant to weapons and armor , but only to attacks that deal physical damage ) . AP grinding . To receive high levels of AP for the party , the player should customize their weapons with the Triple Overdrive , Triple AP and Overdrive → AP abilities , and place two characters ' Overdrive in Comrade mode , and one character in Stoic mode ( the character attacking being the one set to Stoic ) . While fighting Don Tonberry , the player should cast Hastega on everyone and then get Don Tonberry to counter with Karma the character whose Overdrive mode is Stoic , then revive him / her with the other party members and recast Haste . The player should repeat this until Don Tonberry is dead or gets too close and the player is forced to flee . When Don Tonberry counters with Karma , the damage will fuel the Overdrive , which will triple and then convert into AP , and at the end of the battle the total AP is also tripled . The AP is received even if the player escapes the battle , or the Overdrive gauge is full . It is possible to go from 0 to 99 Sphere Levels in one battle with three characters using this method ; it is only limited by the party ' s MP and how fast Don Tonberry closes in . The amount of Overdrive received is determined by the amount of damage received which , for Don Tonberry , is the number of monsters a character has killed multiplied by 100 . Only the Overdrive → AP ability is needed for this trick , but the other two abilities will boost the amount of obtained AP . The only character that needs to receive damage from Karma is the character whose Overdrive Mode is set to Stoic , meaning one can easily level up a weak character by skipping their turn and having a strong healer and a character who has had a lot of kills to perform the trick . Even weak characters can use this method . An alternate method is to use weapons with SOS Overdrive and Overdrive → AP , armor with SOS Haste , and Auto - Life . This is the fastest way to accumulate Sphere Levels and travel the Sphere Grid . This is especially useful if one plans on rearranging the Sphere Grid for stat maxing . One can also use this method with Cactuar King .