First u need a female snorunt, poke'radar required and anytime of day. (to get poke radar c all 210 Pokemon i sinnoh pokedex, then show Pro.Rowen.) or migrate it from emerald or Sapphire or ruby. then use a dusk stone on it.(if not dusk then dawn)
Pokemon Indigo does not exist.
The Pokemon you can find in Acuity Lakefront using the Poke Radar on Pokemon Diamond is Snorunt. Snorunt can be evolved into Glalie at level 42 or Froslass if it's a female and you use a Dawn Stone on it.
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 :)
you can't catch it because you already beaten the legendary
you can catch a lot of unknown Pokemon A-Z
you cant catch it in gold if its a boy you can catch it in blue if its a girl you can catch it in purple
Froslass
You cant. You have to catch a Female Snorunt and use the dawn stone on it. PLZ VISIT MY BIO PAGE MY NAME IS UNQ2
you evolve a female snorunt with a dawn stone and then you have a froslass P.S Hope i help
SoRrY, bUt ThErE iS nO fRoSsLaSs In PoKeMoN dIaMoNd.... but there could be, i may be wrong. but there are many websites you can go to to find out.
Kirlia - Gallade Snorunt - Froslass
you need to use the poke rader and find a girl snorunt and give it a dawn stone and it will evolve in to froslass
Evolve Kirlia Into Gallade,Snorunt Into Froslass
Use a Dawn Stone on a female Snorunt
Male Krilia and Female Snorunt to Gallade and Froslass
CAtch a girl snowrunt And use a dawn stone
Froslass is in diamond, pearl, platinum, heartgold, soulsilver and soon to be coming black and white versions. Froslass is obtained by using a dawn stone on a female snorunt.
Froslass cannot be found in any Pokemon game that was released before Pokemon Diamond and Pearl.