Originally Posted by Fat /B/utterfree
I prefer HP Ground - it goes really well with Blizzard (which is still a good move, even with 70% accuracy) and Volt Switch/Thunderbolt/Thunder, and allows Rotom-F to handle most Steel-types adequately. As a TrickScarfer I view Rotom-F to be the best in both NU and RU. Electric/Ice may not be terrific defensively, but it does allow you a lot of offensive merit both STAB-wise and coveragewise (you could even run HP Fire, or HP Fighting, and not lose any coverage potential).
to be honest, though, everything that you want to hit with hp ground can simply be volt switched out of bar stuff like golem, but that's decimated by hp ice anyway. having additional coverage outside of STAB boltbeam in NU is really unnecessary imo since there's nothing in particular you need to hit. a reliable stab move is preferential - there are scenarios where you simply cannot rely on that 70% accuracy to bail you out when simply using hp ice would have sufficed.