Rest

Rest is a -type move introduced in Generation I. It causes the user to fall asleep for two turns, during which it will recover health. Using Sleep Talk with this move is good because the user can still attack while under the sleep status. Though the enemy can attack during the two moves, it's not much of a useful move.

Red/Blue/Yellow

 * On the S.S. Anne by Vermilion City

Gold/Silver/Crystal

 * 1st floor of the Ice Cave

Ruby/Sapphire/Emerald

 * East of Lilycove City in a house by the man who gives the player berries

FireRed/LeafGreen

 * On the S.S. Anne near Vermilion City

Diamond/Pearl/Platinum

 * Game Corner in Veilstone City, for 6,000 coins.
 * Can be found as a rare Pickup item.