You need to train/evolve Abra/Kadabra or you can get it by trading with a friend or over WFC.
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in pokemon pearl,diamond or platinum you have to eight badges in pokemon black and then trade kadabra to you from yourself and it will evolve
Kadabra evolves to alakazam by trading it though it won't evolve if you migrate it to diamond from firered or leafgreen so what do you do? Get a kadabra in diamond trade it to a pearl version take it back and it will be a alakazam.
Kadabra can only evolve into Alakazam when it is traded. You can trade it at any level and it will evolve.
The best psychic Pokemon on Pokemon diamond is alakazam. It can beat an infernape level 100. who carez about a dull looking Pokemon with two unusually big mustaches... ew... but I like Lugia and Espeon... and Gallade... and Gardevoir... bronzong all the way haha
Trade a kadabra to a friend then take it back to receive alakazam.