Give it an Ice Rock.
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you cant evolve eevee into glaceon.
eevee does only evolve into glaceon in dimond, pearl, platinum ss and hg
You don't use a stone to evolve Eevee into Glaceon, instead you need to head to the grass patches near the Ice Rock that's near Snowpoint City and level it up there and it'll evolve into Glaceon.
You cannot evolve an eevee in to a glaceon. You have to trade one from Pearl, Diamond, or Platinum.
There's an everstone you get at the beginning of the game. Give it to your eevee and level it up. The more you level it up the more likely you are to get a glaceon.