So this is the first time i've posted something here (besides votes) and I've gotta say this slate is a little boring. Magma Storm Rotom is definitely an improvement over Overheat, but as many other posters have pointed out it can't really trap and kill it's counters, although the chip damage and being able to stop your opponent from switching out is pretty cool. I really don't know how adding a fairy type to Blissey will affect it or the metagame, but it seems pretty meh to me. Unless your team is really weak to fighting or needs the type coverage fairy adds Chansey overshadows it. For balanced teams I feel Clefable will still be preferred for having (some) offensive presence and two fantastic abilities in Magic Guard and Unaware.
Shift Gear Lucario would almost certainly affect the current metagame more than any of the other three, but what's the fun in adding another sweeper? Especially one that can afford to run adamant nature and still outspeed all but the fastest scarfers. It has tremendous power, and only needs the opponent's team to be slightly weakened in order to clean. I don't think it would be broken, but Lucario definitely doesn't need a buff this big to stand out in OU.
Trace Virizion is almost guaranteed to get my vote at this point, unless someone can bring up some good points about the other noms. Trace gives her such great utility, as others have already pointed out, from switcing into Heatran and getting Flash Fire, to switching into Lando-T and getting Intimidate. She also wipes the floor with sand and rain teams. While Trace (probably) won't make her a top tier threat, it at least gives a viable niche and lets her stand out.
Shift Gear Lucario would almost certainly affect the current metagame more than any of the other three, but what's the fun in adding another sweeper? Especially one that can afford to run adamant nature and still outspeed all but the fastest scarfers. It has tremendous power, and only needs the opponent's team to be slightly weakened in order to clean. I don't think it would be broken, but Lucario definitely doesn't need a buff this big to stand out in OU.
Trace Virizion is almost guaranteed to get my vote at this point, unless someone can bring up some good points about the other noms. Trace gives her such great utility, as others have already pointed out, from switcing into Heatran and getting Flash Fire, to switching into Lando-T and getting Intimidate. She also wipes the floor with sand and rain teams. While Trace (probably) won't make her a top tier threat, it at least gives a viable niche and lets her stand out.