Cheezy the Wiz
Socialist In A Hurry
That's basically what Gary says to you anyway.
And Gary was the last rival who actually made you sweat. Silver, May/Wally, Barry, Cheren and Bianca, and Hugh (and N?) are all laughable trainers. They're not rivals, they're pests. Gary, apart from the Pokemon Tower battle (and even then only because you weren't likely to go up there until after you'd cleared the Casino), is the most challenging trainer you face, short of a specific gym leader situation due to typing.