Stalling Clefable could be torn between Magic Guard and Unaware. There are other good Magic Guard users now, so it might actually be better to play Unaware at times so that something like a non-Choice Band Gyarados can't do much to it.
Dragon Dance Rest Lapras with Hydration, paired with Politoed? ...eh, seems a bit contrived. Nice effort at a new ability, though.
Guts for poor neglected Flareon. Well, I guess Flareon is slow enough that paralysis doesn't matter much, but that's the whole problem. It can't even really abuse Toxic poisoning because it doesn't have the Speed for that, and it's immune to burn...
Electivire with Vital Spirit can switch in on Trick Swimming Goggles, I guess.
Excellent choice for Poison Heal on Gliscor. It's going to love recovering even more HP every turn.
Thick Fat was much-needed for Mamoswine, and also an excellent choice. Now it can take Ice attacks and get in on something other than Thunderbolt.
That about covers it for older Pokemon learning abilities we already know the names of that are listed in the first post (as opposed to A125 and such)...
Don't know what the new ones are for Nidoqueen, Nidoking, Arcanine, Slowbro, Gyarados, Aerodactyl, Feraligatr, Crobat, Slowking, Forretress, Heracross, Ursaring, Skarmory, Smeargle, Salamence, Empoleon, Drifblim, Lucario, Weavile, and Gallade, but I can't wait to find out since those are a bunch of other Pokemon I like and most of them have either junky abilities, highly overspecialized abilities (Own Tempo against Dynamicpunch), or a good ability but it's the only good option. Tyranitar too, kind of, but Sand Stream is really hard to argue with.