you must go upstairs in the Pokemon center. Find the correct lady behind the counter to talk to. she will make you enter a room. Hope this helped.
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You must trade with someone to evolve a Kadabra into Alakazam.
Trade a kadabra to a friend then take it back to receive alakazam.
you have to trade your kadabra with another game, either ruby or sapphire.
Trade it to a friend then take it back it will be an alakazam now.
Kadabra evolves when you trade it to another person