She is in the Indigo Plateau where the rest of the Elite Four is.
Not really. Sell them, or give them to Pokemon to hold.
After you have obtained both the Ruby and Sapphire gems, you should go back to One Island so Celio can fix the machine he's been working on. By returning the two gems, trade with the Hoenn region is unlocked (ie. you are now able to trade between your version and Pokemon Ruby, Sapphire and Emerald). The two gems do not unlock anything else, but clear a significant obstacle which prevents you from completing part of your National Pokedex.
With the dotted holes in leaf green, that is where you get one of the gems to get inside the Rocket Warehouse. Just have a Pokemon that knows cut, go up to it, then press START, POKEMON, ???, CUT. It's that easy!
You find normal gems in shaking ground in most caves. I find that shaking ground is more common in Twist Mountain. Also, if you wanted to find another gem, for example, a dragon gem, it is exactly the same.
It is the combination of a part of Riolu(head) and Eevee(body) and it evolve into a Darkremo which is part of lucario(head) + eevee(tail) + absol(body and the neck thingy) + weavile(gems for the neck gems). It can only be obtained by donation in the Pokemon battle arena, uncatchable in psychic map(even with masterball)
Just go to the 1 Island Pokemon Center, go upstairs, and trade.
The fire gems can only be retrieved during the Christmas Event
you find every single Pokemon and then you go to her and then you ask twice and she will gve you three moon stones, five fire, and two sun.
In Leaf Green And Fire Red, for Johto Pokemon you need the national pokedex; this was obtained when you gave the blue and red gems to Celio in Island 1
the underground
An individual can purchase fire mountain gems in many stores. One of the stores include fire mountain gems website which is dedicated towards selling these goods. The same company also has their own stores throughout the country.
you must catch 60 Pokemon
Gems weren't made yet but they didn't hide the bar
I think you get gems by playing Sableye's Gem Journey
Not really. Sell them, or give them to Pokemon to hold.
Here are some kinds of gems: fire opal, diamond, ruby
No You don't.