There are literally dozens of sidekicks just in the golden age of comics, alone, yet very few back then actually met other mighty mites. A rare exception was the Boy Buddies, aka Dusty the Boy Detective and Roy the Super-Boy! Even though their padres never much hung out with one another, this pair had a budding relationship.
Poor Pinky the Whiz-Kid. Why? Well his name was...Pinky...the Whiz-Kid! Apparently, all the cool aliases had already been handed out (course he could've swiped one, like a certain Kryptonian brat of one of the buddies). And also, he seemed to be alone in the world of sidekicks on his world...unless you count young Mary and Cap Junior but they pretty much were standalone characters. It would've been neat had he have met a pair... like these two today!