Aurostice is a solid Ice-type Pokémon, if not a great one. She has a great Special Attack stat with usable Speed and decent Special Defense with a great movepool to take advantage of the high Special Attack. Only problems is that she's only resistant to one type (Ice) and doesn't have great Defense.
In Procyon and Deneb, Aurostice and her pre-evolutions are now Ice/Fairy types blessed with the rare Pixilate ability, replacing Inner Focus. Her only downsides are that she is exclusive to Deneb (so you would have to trade through VBA Link or hack her if you are playing Procyon) and as of the current demo, Aurostice is unable to learn any special Normal-type moves to go with Pixilate. However, there is a high possibility that she will learn one via a future TM or move tutor (Hyper Voice) once the game fully releases with said tutor and full TM roster.
Be sure to give Frozaiden an Everstone until she reaches level 35, as Aurostice cannot learn Ice Beam through any other legitimate method. Also, for those who play Vega Minus Fairy type edition, Aurostice will learn Moonblast at Level 51.
Like her pre-evolved forms, Aurostice seems to be directly based on a yuki-onna, a yōkai from Japanese folklore. She might also be inspired by Froslass (another yuki-onna inspired Pokémon) and the Ralts line, particularly Gardevoir, evolution-line wise, stats and diverse movepools.
Name Origin[]
Frolia is a play on the English word frost (Japanese transliteration: フロスト, furosuto).
Aurostice is a portmanteau of aurora, frost and ice.