You can't I've tried looking but there in no leaf stone
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You may find a leaf stone in Alexa forest or Viridan Forest. It is in one of those places. You will have to look hard for it though.
There is no such thing as the Ilex Forest Protector. No one protects the forest. It is only an obstacle to get to Goldenrod. There is no protector available.
The fastest way is to earn points on the Pokemon-a-thon and buy a Leaf Stone there for 2500 points. The Leaf Stone is available at Thursdays I think. You can also get a leaf stone from Bill's Grandpa if you show him an oddish, he is just above Cerulean city. and you can find a leaf stone in viridian forest.
No, you cannot evolve Eevee with a leaf stone. It can evolve into the leaf type Pokemon, Leafeon, but it evolves by leveling it up in Eterna Forest in Pokemon Platinum
There is no mossy Rock in Ilex Forest. The only Mossy Rocks are in Pearl/Diamond/ Platinum/Black/White