#4 The Rock
They called him "The Great One," but he bypassed few divisions throughout his career. He started his career in the mid-90s as Rocky Maivia but soon gained prominence as The Rock. Despite his huge success, he could not win any tertiary championship.
He won two Intercontinental, eight WWE, and multiple Tag Team Championships which makes him a legend. The Rock belonged to a different era, but he came back for another run following WrestleMania 27. Maybe he can come back once again time to complete the 'Mission Grand Slam.'
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#3 The Undertaker
The Undertaker is a legendary wrestler in the WWE. He won WWE and World Heavyweight Championships along with Tag Team Championship alongside Kane. Under his Big Evil gimmick, he also won the Hardcore Championship in 2001.
Like his fellow wrestlers from the Attitude Era, he never made a halt in every division before zeroing in on the main event. He fought for the Intercontinental Championship but never won it. 'The Phenom' is a future Hall of Famer who has never won the Intercontinental strap. Unless something drastic happens, this is not going to change.