Psychic (TM 29) is found on Victory Road, while on your way to the Pokemon League. Also I believe you can buy one on the Battle Frontier later in the game.
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You can buy it at the game corner.
route 13
NOWHERE.The TM trick is not available as a TM in Pokemon Emerald
you can buy it at lillicove departmeant store at TM floor
you can only find TM 25-thunder at lilicove department store.