The note in the Ilex forest is towards the beginning of the forest. It is next to the Celebi shrine. You will most likely need cut to access the note and shrine, though.
Celebi
West of azalea town.
ilex forest shrine
It is in Ilex forest.
i think you use a leaf stone
ilex forest isn't in pokemon white
It is not possible to visit Ilex Forest in Pokemon FireRed as it's a location exclusive to Pokemon Gold, Silver and Crystal. Pokemon Gold, Silver and Crystal are the only Pokemon games that let you visit more than one Pokemon Region.
Get it in Ilex forest, and it evolves at level 35.
do something
Celebi is the protector of the Ilex Forest.
Go through the Ilex forest in Azalea Town.
The Headbutt move tutor is located in Ilex Forest.