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Name wise there's nothing like Doom Desire. :D As for an actual move that I've used I'm going to say Earthquake. I always make sure that at least one Pokemon on my team knows it. The KO potential is just too great to resist. :)
Generation 2 Hyper Beam. Oh my good, that ear raping sound and the way the screen violently shook. So epic and powerful... and then came Gen 3. The confetti Hyper Beam. :/
at the moment it has to be MEGAHORN........i just had a heracross in battle tower yesterday and he one hit ko'ed every pokemon and gave them permanent concusions