Pokémon Ruby and Sapphire/Evolution Items

Evolutionary stones
A Pokémon that can evolve with the help of an evolutionary stone will evolve the instant the stone is used. Be careful doing this since most Pokémon stop learning new moves after this kind of evolution (there are some exceptions).

* Note: The second Pokémon listed in parentheses is what your Pokémon will evolve into if this evolution item is used on them.

Hold items that cause evolution
Unlike with the evolutionary stones trade items require a bit of work before the evolution will happen. Right after trading the Pokémon it will evolve and the hold item will be expended (they can only be used once ever).
 * To evolve a Pokémon with a hold item follow these steps
 * 1) Have the desired Pokémon hold a trade item that will make them evolve.
 * 2) Find a friend or extra Game Boy Advance to trade with.
 * 3) Trade the Pokémon and trade it back (or optionally trade with the intent of giving your friend a Pokémon that will be evolving).

* Note: The second Pokémon listed in parentheses is what your Pokémon will evolve into if this evolution item is used on them.