Normal: "A fiend whose tough carapace protects it from Normal Attacks but leaves it vulnerable to magic. Its attacks are straight-forward and unrelenting." Oversoul: "A fiend whose tough carapace protects it from Normal Attacks but leaves it vulnerable to magic. It sometimes performs an irritating attack that destroys Phoenix Downs." — Scan
The Bicocette is an enemy from Final Fantasy X-2. It does not have a weakness and its Defense stat is very high. However, it has low HP and Magic Defense, so magic is the best option.
In the Fiend Tale endings, one notable Bicocette was created from the spirit of a bandit who was betrayed by his associates while claiming to know how to use the Doom spell. However, upon mastering the Doom spell, the Bicocette's intent to scare his killers ended up being plain murder to his horror before finding himself attack by the Doom specter.