1) Monotypes are incredibly generic. I'm pretty sure every site has one, and if they don't they will soon. That almost completely ruins the luster of Pokerealm, it being more novel in concept than a generic Pokemon site.
2) Monotypes are incredibly easy to trump. For the most part, anyway.
3) It's too much hassle to add yet another row of badges to the profiles, and expect to keep them updated.
4) You can't have a Champion without first beating the Elite Four, for obvious reasons.
5) If Cirrus decides to implement one, as secondary administrator, I call Fire-type.
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And if you go chasing rabbits
And you know you're going to fall
Tell 'em a hookah-smoking caterpillar
Has given you the call