Seems like you don't really know the difference between a joke character and a grappler. Ganondorf is a true grappler in Smash. And while by design he has some bad matchups, he does have good matchups in this game.
Honestly Ganondorf is more a Grapple character in spirit than a True Grapple character. He carries many of the iconic elements of a Grapple character, with his large and powerful nature, access to a command grab, and his mix between threatening opponents with his massive damage and punishing mistakes with good reads, while also sharing many of the same weaknesses with other Grapple characters.
That all said, the one thing Ganondorf really is lacking in terms of what makes a True Grapple character is, well, the centralization around the actual grappling. Ganondorf isn't grabbing people that much more than the majority of the cast does. His grabs aren't setting up massive combos, nor are they dealing a large portion of his damage output, nor are they key tools to scoring the KO. Even his command grab serves more as a longer ranged punish than it serves the role a True Grappler's throws do. In all honesty Ganondorf is more of a Bruiser character or a Semi Grapple character than he is a True Grapple character.
That said, aside from Ice Climbers (Now gone) and Dedede (arguably less so in this game), most Grapplers are Semi Grapplers at best in Smash.