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Mono-poison seems popular! I had a mono-poison team in Pearl a couple years back. I know I had Roserade and Gengar, plus like two other Pokemon and HM slaves.
Right now I'm doing mono-ghost in Platinum, though it didn't really start until after the first gym, where I caught Drifloon. Currently have Drifblim, Rotom, and Haunter. i forgot to grab a misdreavus ;-;Fantina and the first Cyrus battle were both genuinely challenging! I can't evolve Haunter though since I'm using a phone emulator, but it's kinda fun using unevolved pokes.
I'm planning on doing a monotype in HGSS soon but I'm not sure what type to choose.
I like doing monotype runs because it makes the run harder and I really get to connect to different types.