I would suggest Froslass because...
Froslass has better base stats. Glalie has even base stats, but Froslass trumps Glalie in speed (Froslass: 110 base speed, Glalie: 80 base speed)
Froslass is also immune to normal and fighting, where as, Glalie isn't immune to anything. Froslass is also resistant to Poison, Bug and Ice, where as Glalie is only resistant to Ice.
However, because Froslass is ghost and ice, it is weaker to more types than Glalie is
I don't really know about their move pools, but from a first glance, they look equal. I'm currently training a Froslass (I was torn between Froslass and Glalie as well), but I've never even battled with a Glalie, only against it in Leaf Green.
A Dawn Stone is used to evolve a male Kirlia into a Gallade and a female Snorunt into a Froslass.
In the Pokémon video games, the Dawn Stone will evolve two Pokémon as of Pokémon X and Pokémon Y and it will evolve a male Kirlia which will allow it to evolve into Gallade and it will evolve a female Snorunt and it will allow it to evolve into Froslass.
A male Kirlia can evolve into a Gallade using a Dawn Stone (Kirlia is unavailable in White and you have to trade or evolve it from Ralts, which you can catch in White Forest.)A female Snorunt can evolve into a Froslass using a Dawn Stone (Snorunt is unavailable in White and can be obtained through trade or Poke Transfer from a Gen. IV game.)
I think you must be talking about froslass, froslass is not a legendary Pokemon as it can be bred with a ditto in the day care or with another Pokemon of the opposite gender so it isn't legendary. i hope this helped :)
Gallade is. Garchomp and Gallade can learn Dark Type moves, and Gyrados can learn Ice.
It evolves Kirlia into Gallade and Snorunt into Froslass.
using a dawn stone you can evolve: Male Kirlia into Gallade and female Snorunt into Froslass
Evolve Kirlia Into Gallade,Snorunt Into Froslass
No, because it has two weak pokemon. You should get a Rapidash.
evolves male kirlia into gallade and female snorunt into froslass
Kirlia - Gallade Snorunt - Froslass
Male Kirlia-------Gallade Female Snorunt-----Froslass
It can evolve a male kirlia into gallade and evolve a female snorunt to a froslass.
Female snorunt into froslass and male kirlia into gallade
Snorunt(girl)-->Froslass Kirlia(boy)-->Gallade
male Kirlia into Gallade and female Snorunt into Froslass.
Kirlia into gallade [Male only] and snorunt into froslass [Female only].