You can get the Item finder from Professor Oaks in Pokemon LeafGreen. Professor Oaks is found on route 11 just out side of Vermillion City.
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use the itemfinder and you will eventually find a lot
Use the itemfinder at the spot where mr fuji once stood at the top of Pokemon tower you should dig up a soothe bell. where mr fuji was standing use your itemfinder there
go to bills secret garden. use hella max repels trust me this worked. spin in a circle 360 times around the back bottom right corner of the garden. this will only work if you have the itemfinder. then once you spin 360 times use the itemfinder and there you go a mewtrance on Pokemon leafgreen
The itemfinder will point you in the direction of where hidden items are press A in that direction to find the item.
Ether is a very helpful item that none of the pokemarkets sell. You only way of having an ether is by finding it. An itemfinder is most useful.