Where can you see an Alakazam on Pokemon Diamond?

[[ YOU CAN'T SEE AN ALAKAZAM ANYWHERE YOU NEED TO TRADE A KADABRA TO GET AN ALAKAZAM. ITS A TRADE EVOLUTION. ]]

That's a load of crap...

Just go to Lucian of the Elite Four, he has an Alakazam in his team. He's also the final and strongest of the Elite Four, aside from the champion Cynthia of course..

It will register when you fight lucian.