Here's some I just thought of with no imagination at all:
Powerhouse (for the lols and giggles)
Shaquille (After Shaquille O'Neill, it sounds like Shuckle [WHAT?])
Raphael (Teenage Mutant Ninja Turtles)
EmperorNBZ (A youtuber who's favourite poke is shuckle)
Bob (I'm not the best with nicknames)