i think it is because they can learn flash...
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It's the same from Fire Red.It looks like you think that Pickachu appears Fire Red because they are very rare from Viridian Forest.You can find Pickachu easily at Power Plant near Route 10 and Rock Tunnel(Note that you need Surf to cross it).
Abra cannot learn Rock Smash. Abra can learn some TMs which help a lot as it doesn't learn any attack moves by itself until it evolves.
go into lavender town and go up to rock tunnel o you need flash too hope i helped! well that's where cubone is in rock tunnel!and cubones evovled forem too!
To get the everstone on Pokemon Leaf Green, you will need to catch 20 Pokemon. Once you have achieved this, visit the rock tunnel. Inside the rock tunnel, you will be greeted by a man who will grant you the ever stone.
In order 2 get to rock tunnel u need 2 have cut.u go 2 the east of cerulean city and use cut at the tree.go beat all the trainers and find the right way.