The two heavyweight superstars finally go head to head in front of 90,000 this weekend with both fighters appearing to be in confident mood in the final press conference ahead of the fight.
But Klitschko, fighting for the first time in over a year after his shock defeat to Tyson Fury in 2015, believes he will be the victor and has backed up his big talk.
"I'm not Nostradamus but I recorded a video of my prediction of the fight," he said. "This stick is going to be in my robe which I'm going to wear on Saturday night.
"Do not ask me after the fight what is on the stick. The only person who is going to be able to open it up and watch it is the person who is going to buy the robe with the stick.
"The money will go to the Klitschko foundation."
World champion Joshua has been putting in the hard yards in training camp and after what has felt like a marathon build-up is now just eager to get in the ring and settle matters once and for all.
“I’m looking forward to competing again," he said. "It’s just me and a man coming to blows. I’m still up early in the morning and very late at night.
“I’m prepared physically and mentally for any battle. I enjoy the sport and take it seriously. April 29 is just another stepping stone towards greatness.
“Any fight is the right fight. For you guys - to broadcast and to entertain - you want certain fights. But I’ve never shied away from any fight.”