Mandatory challenger Pulev takes on Joshua at Cardiff’s Principality Stadium on Saturday, October 28, for the WBA ‘Super’ and IBF heavyweight world titles.
The clash will be Joshua’s first since he beat Klitschko in a magnificent fight which he ended by knockout in the 11th round.
However, Pulev is hopeful he can be the first man to beat the British boxer, who he claims is not yet the complete package.
“I watch Joshua more than I do any other boxer,” Pulev said.
“I see what he does well and see what he does badly – I study him.
“Everyone must learn more, whether it’s myself, ‘AJ’ or anyone else. When one man says that he knows everything, he is lying.
“When Klitschko fought ‘AJ’ it was 50/50, but he did not prepare properly. He thought he would beat Joshua no problem.
“You learn from losses. I enjoy my training now and my preparation has been concentrated, strong and smart – I’m ready.”
Bulgarian Pulev’s only career defeat came against Klitschko when challenging for the same titles in 2014.
Since then, the 36-year-old has won each of his last five fights to gain another shot at the championship – and he feels he has learned a lot since.
“I don’t just say I learnt this or that from the Klitschko fight. I learnt many things,” Pulev added.
“From one loss, a man learns more than when he wins.
“When you win you think you are the number one and nothing more is needed. A loss makes you do more and more.
“I see now that I was not ready for Klitschko, maybe I was too young, but now my preparation is much better, I feel stronger and I am ready.”