Mewtwo: in Cerulean Cave in Cerulean City after you have defeated the Elite Four and your rival after the Elite Four.
Entei, Raiku, Suicune: Pretty much for the entire game they have been teleporting all over the region. Get alot of Max Repels and a pokemon between lvl 30-40 and go to route 2 and walk around for a bit but make sure to go in and out of the building for Entei, Raiku, or Suicune can teleport to a new area.
Hope this helps! XP
in my but
Not in Pokemon leafgreen only in Pokemon Firered never ever in Pokemon leafgreen And in Pokemon firered it is rare in power plant not available in Pokemon leafgreen?
It is rare on One Island
you can get a shiny Eevee on Pokemon leafgreen but its rare. its about a 1/5000 to get it
it's rare to find a moonstone
by cheat
Only zubats =)
You can find some in Mt. Moon
you use a ultra ball
in order to get mew two go to cerulean city cave,
Rare. Virdian Forest and Power Plant.
Anything tbh you can defeat the Pokemon league again or catch other rare Pokemon:)