What a phenomenal addition an HA capsule is! It's a decade overdue, but still appreciated. I will admit: I went through the trouble of collecting one of every breedable pokemon with it's hidden ability. I liked the fun collecting them all and tracing them back to whatever weird place I could with the dream world long gone. That said... abilities that are instrumental to so many Pokemon's success absolutely shouldn't be gated off so awkwardly. Every Sinnoh starter and 2/3 Hoenn starter HAs being gated off by an ancient japan only event and their descendants is dumb. HA regis coming from a 4 year old even you couldn't SR for blew. VGC 2019 essentially requiring some obscure Lugia event for it to be any good sucked. So happy to have this! Not to mention, it'll fix a ton of my awkward breedables from over the years. Happy to finally get this shiny Blaze Torchic Speed Boosting.
I find it kind of odd they don't let the process be reversable, however. The only real problem I see with it all is Fissue Machamp from Gen 1, but it's just fine? Sanctioned play uses galar native or battle ready marked stuff which deletes the move anyway. 6v6 formats of course ban the moves outright, but their observed very passively if at all by the devs. The only places where it'd actually be allowed are A) Free battles online or with friends and B) the occasional "bring anything" competition like the Extreme Speed Battles competition a while ago. And there it's relatively fine too with solid counterplay, especially this generation with Dynamax to counter that stuff instantly.
Also I want the random shiny cute charm HA milotic I accidentally bred years ago to have a proper ability pls gf. I guess it's also cool for letting curse Scizor and other random VC mons to have their normal ability.
What's new with an ability capsule though? We've got a few general families of neat new stuff to look at. Stand out things I can think of include:
Anything still without its HA. - HA Galar Fossils are neat for the ice ones in particular. Heatran's waited so long to hatch my eggs. Well deserved. Telepathy Tapu Fini is also kind of interesting.
Anything with Gen 3&4 exclusive TMs - Unaware Softboiled Clefable is the biggest addition I've seen and can think of. Counter Alakazam can have stuff like Vacuum Wave with it's Magic Guard.
XD Exclusive moves - The birds all get their cool attacks. Electabuzz and Magmar families can redirect sleep safely now.
Old Events with exclusive moves - Extreme Speed Raichu with Lightning Rod I guess? Cloud Nine Wish Lickilicky?
HA of forms that previously didn't have access to their HA - Off the top of my head, that includes Small and Large Pumpkaboo (normal is in friend safari, giant is from a 2014 event). The non-spring Deerlings and... the Blue Florges family if they were actually in the Crown Tundra dex.
Weird lone attack Pokemon from recent generations - Make way for Flame Body X-scissor Centiskortch.
I'm really in love with expansion pass so far. The battle-ready mark letting me use all my old Pokemon without rebreeding for the exact same with is such an awesome QoL change. Can't wait for this one too and any other awesome QoL changes the crowned tundra brings.
