Raises:

C- to C

Rotom(-F)

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C to C+

Liepard
Mesprit (?, really solid Healing Wish user. galbia approves)

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C+ to B-

Cradily
Hitmontop
Sawk
Sneasel (?, really solid Dark-type with tournament usage)

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B- to B

Lanturn
Skuntank (?, same reason as Sneasel)

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B to B+

Gurdurr
Eelektross
Whimsicott
Heliolisk

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B+ to A-

Exploud
Fletchinder (???, I actually think this one is much better than everything else at current B+)

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A- to A

None (Actually, with the exception of Banette and Registeel, this rank is probably one of the most realistic ones)

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A to A+

None, possibly Cresselia though.

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A+ to S

None, but Reuniclus, Cobalion and Slowking are really metagame defining in comparision to the rest of A+)

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Drops:

Banette (A- to B+)
Registeel (A- to B+)
Golbat (B to B-)
Gorebyss (B to B-)
Mismagius (B to C+)
Gastrodon (B- to C+)
Vivillon (B- to C+)
Meowstic (C+ to C)
Is Barbaracle any good? I'd probably move that one to C- too

New Pokemon:

Lunatone (Unranked to D, good Moltres counter with Stealth Rock, Moonlight, Levitate and respectable base 95 Special Attack. It has some good gimmicks such as Cosmic Power or AncientPower + Baton Pass too)

Magnemite (Unranked to GOD / Wobbuffet rank: In honor to the user + inside joke about NU nominations)