E-rank is kind of reserved for Pokemon that are memeticly bad and overused; the Pokemon that should never be used in Ubers but still are is a fairly large list and mostly common sense. Charizard is iconic for the ladder scrub (we've written two Smog articles on it ffs), and Shedinja looks deceptively viable when in reality it's just trash. There aren't really any Pokemon that have similar cases to these two, and there's no reason to clog the list with completely unviable shit like Torterra or Feraligatr.
(Actually Sheer Force Feraligatr might be hilarious now that I think about it.)
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