The Flan Master, also called Master Flan, is a boss in Final Fantasy IV Advance and The Complete Collection. It appears in the Cave of Trials and guards Palom's ultimate weapon, Triton's Dagger.
Stats
Battle
Flan Master attacks with two Black Flans and two White Mousse, which it will reform when they all die. It casts Reflect on itself, then bounces Thundaga, Flare, and Drain spells off itself, in that order.
Strategy
It is best to use Palom's magic to kill off three of the Flans then have Cecil and the rest of the party use physical attacks. Porom should also be brought along, to heal the party and cast Twin Magic with Palom if needed. She can also cast Reflect on the party so Palom can bounce his magic back at the Flan Master; this method is quite dangerous, as it may hit the fourth Flan and revive all of them.
Other appearances
Pictlogica Final Fantasy
Final Fantasy Record Keeper

Etymology
The word Flan refers to an open pastry or sponge cake containing a sweet or savory filling. A typical flan of this sort is round, with shortcrust pastry, usually coated with sweet syrup. It is similar to a custard tart or a South African melktert.