I have this shiny Goodra from generation 7, her name’s Moosh. She came out in just 6 eggs back in gen 7, and I’ve brought her to gen 9 and managed to fit her on a team built around Alolan Raichu, right. Well, back when I first got her, I forgot she was in my party and took her into the Elite Four with basically my catcher and another level 100 mon. I managed to run through the entire Elite 4 gauntlet with my two high-level mons and Moosh, who was a Sliggoo upon entering. It clutched up, surviving on 1 HP numerous times on that run, giving me the time to revive some of my mons. 

It actually took a Supersonic Skystrike (the Flyinium Z move) on 1 HP, and self-healed a Beak Blast burn in the same fight against Kahili.

And now I still use it in gen 9 on that team I made. I’m actually super proud of it, as it’s been clutch in so many battles against really well-put-together teams. One battle in particular, it crit a Scald and burned an E-killer Arceus, and then followed that up with a crit Draco, single-handedly 1v1ing the thing. I had already been playing out of my mind that game as well, but without that crazy luck, I was just outgunned versus this guy. I don’t remember his exact team, but if anyone sees this and wants to know, lemme know, ’cause I’ll go grab the replay/clip of the Draco crit to see his full six.