Malboro Menace is an enemy in Final Fantasy X fought at the Monster Arena in the Area Conquest once the player has caught at least one of each of the fiends located in the Kilika area: Dinonix, Killer Bee, Yellow Element, and Ragora.
One of the more difficult fiends to kill, the Malboro Menace starts with an ambush and uses Putrid Breath. Attacks and magic can deal full damage. It attacks a party member with Mega Gastric Juice and inflicts Full Break. Its Gastric Juice Blast spits from its eyes multiple times on the party and may inflict Petrify (50% chance). Both of these attacks do the same damage regardless of stats, although Gastric Juice Blast can be reduced by measures such as Protect.
Malboro Menace's most damaging attack is Chow Time, where it swallows a party member and regurgitates them immediately inflicting all Break statuses on them.
Its most dangerous attack is Putrid Breath, which is similar to Bad Breath, and hits all party members randomly inflicting several status ailments: Silence (by 8 turns), Darkness (by 8 turns), Slow, Poison, and Confusion. Status Ward armor will not reduce the effectiveness of any of these, although they can still be blocked by Statusproof or Ribbon. Putrid Breath also inflicts physical damage; while the damage is determined by Malboro Menace's Magic and the targets' Magic Defense, it is mitigated by Protect rather than by Shell. Malboro Menace will not use Putrid Breath for a second time until after it drops below half its HP, and will never use it against aeons (who would be immune to the status ailments). If an aeon is summoned on a turn Malboro Menace would use Putrid Breath, it doesn't "forget" about using it, but puts it "on hold", and as soon as the Malboro gets a turn against characters, it will use the overdue Putrid Breath.
Malboro Menace drops many weapons with status-strike abilities, and many status-proof armor. If it drops a weapon it has Poisonstrike as fixed ability, and if it drops armor it has Poisonproof as fixed ability. Both armor and weapons dropped by it give the wielder a hidden critical hit bonus of 6% (most equipment, including Celestial Weapons, give 3% critical hit bonus) to all of the wielder's physical attacks.
If sufficient status protection is unavailable, a good strategy is to equip First Strike and use the character's turn to switch to Yuna and summon an aeon. Another option is to start the battle at 1 HP, and have Rikku use Hyper Mighty G.