Capture a paras in Mt.Moon and take it from it.(some times it may not have it)
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a mushroom is just like any other mushroom you can find tiny ones and big ones
if you have found a tiny mushroom, or a big mushroom, you can use that to teach new moves to your Pokemon. the move tutor is either in Fuchsia city, or Lavender town. you will need a big mushroom, or 2 little mushrooms. you can get them by catching either paras, or parasect.
go to the moon cave first then go down some stairs where all the wild Pokemon are paras teach a Pokemon thief so you can steal there mushrooms you are more likely to get a tiny mushroom rather than big mushroom if you use thief and you get nothing don't bother agagain because that Pokemon isn't carrying anything oh and thief still works if you make the Pokemon faint :]
You can get electric Pokemon on Leafgreen by going in the Power Plant. You have to go upwards from the Pokemon Center near the Rock Tunnel until you reach water then surf through the water till you see a Pokemaniac (The Pokemon trainer there) stop there and go ahead and at last you will see a tall and big building, it is the Power Plant.
You get a Tri-Pass or Rainbow Pass and go to Two Island where a person in a house tells you he can help Pokemon relearn moves. You need a Big Mushroom or two Tini Mushrooms and he will teach your Pokemon a move they have forgotten. **Big Mushrooms are sometimes found equiped to wild Parasect (Safari Zone) while Tiny Mushrooms are rarely found on wild Paras (Safari Zone). You should note that Heart Scales do not work with this particualr Move Tutor.