They still evolved Pokemon with a Base Stat of 460+. Meaning that they can evolve Pokemon at any given time. Base Stat does not matter. And there is hardly a "sacrificial" evolution. If any pokemon qualifies, then it would be Scyther into Scizor as they don't change Base Stat. All the others have their stats change some may lower while others still get a boost. Rhydon and Rhyperior don't have the same Base Stat so there really isn't a sacrifice involved. Just evolution. Other Pokemon with lower base stat do the same periodically.