Dodrio:
Could lose Hidden Power, in which case it loses much of its steam. With it, however, it's still as fierce a Choice Bander as it was in RSE - fast, diverse, immune to Earthquake, and packing a powerful punch. Should see more usage in this generation unless Hidden Power goes to the special side.
Dewgong:
Signal Beam becomes special so now it has more than just STAB special moves at its disposal. Yet, at the same time, its stats are still not well suited to its purposes and Lapras still outclasses it, so it's not likely to seeing any more performance than it is right now. Needless to say, though, it's still a very awesome Ice defender, but it sure can't do much else.