Wario's Cameo in HEY! Pikmin!
“This guy is certainly robustly built! However, I'm concerned with the look in his eyes. He's definitely up to no good. Does he want fame? Power? Money? Or...something worse?!”
DID DR LIGHT CREATE WARIO? OR WAS WARIO MARIO'S COUSIN FROM CHILDHOOD?
Comic Super Mario: Die Verwandlung from German Club Nintendo issue 1/1993 (reprint 1/1996) [1]
Sixth panel of page 3. Dr. Light and Mario are shocked about the accidentally creation of Wario.
“Burp! Grunt! Wheeze! I sweat buckets with every step and I can hardly breathe! How could my slim, gorgeous body get like THIS? I shouldn't have gotten so greedy and eaten all those apples!! I guess you really are what you eat!!”
—Wario