Escavalier: Consider it done, it's now B-tier. It's a surprisingly good Pokemon in UU. Bulky, hard hitting(and it just murders most switches in with Megahorn. ) and one of the few great checks to Dragon-types.
Magneton: Down to D-tier it goes
Raikou & Heracross are definitely looking like the odd men out of S-tier.
Everyone is overly prepared for Heracross. The rise of Crobat & Cofagrigus and ghosts in general doesn't make things easier for Heracross; choiced Heracross sets are at their worst right now. I haven't seen anyone make great use out of Heracross in SPL, though this might be a temporary thing. I'm seriously considering dropping it down to A-tier.
Raikou is in a similar boat; you'll be hard pressed to find a team that doesn't at least make use out of Snorlax, Swampert, Scarf Flygon or Rhyperior. No matter what HP you use, something is going to check you.
I might consider rising Cofagrigus to S-tier, because it's the quintessential ghost type. It can spinblock, check some of the most dangerous threats in the tier, and sweep through most teams clean.