Unfortunately, you can not. You would have to use one of the Sinnoh games and trade for it. Same goes for the Pokemon like Magnezone.
You can't, as Johto and Kanto do not have the appropriate Rocks for them to evolve. You need to trade from Diamond, Pearl, or Platinum in order to get Glaceon or Leafeon.
How to change your username
How to add a user avatar
Why was my post hidden?
Flags vs Downvotes
Official PokemonDb League
Type a Pokemon name, type, move or ability to see instant results.