These tier changes were really a mixed bag, mostly positive I find but some, like the lack of steels in NU, are scary. Swellow + Sawk = dominate. Golem up, Regirock up, Alomomola up.
Anyways, One of the most interesting changes I have seen in Mamoswine moving up. I know why Duggy moved up, I know why Alakazam moved up, I can even see Jolteon and Donphan moving up, but why Mamo? Don't get me wrong, its a good poke, but I don't really see its current niche.
Also, one last thing. Cress and Sigilyph in RU... *shudder*
Yeah, umm, have you used Mamo yet? Try it, it's simply amazing. It's ridiculously strong with Icicle crash and earthquake, and the endeavor set almost always gets rocks up. It also serves as a revenge killer for dragons.