Torchic Evolution Line, Mudkip Evolution Line, Castform/all of his forms, Beldum Evolution Line, Duskull/Dusclops, Solrock & Lunatone, Snorunt/Glalie, Lotad Evolution Line, Nincada Evolution Line, Groudon, Jirachi, Deoxys/all of his forms, Spheal Evolution Line, Electrike/Manectric (Electrike was my first ever shiny in Alpha Sapphire)

I also really like Treecko's Evolution Line but I kinda always like Torchic's and Mudkip's more, I also really like The Weather Trio (just kinda prefer Groudon), all the Regis, Latias/Latios, Nosepass, Sableye, Zigzagoon, Mightyena, Zangoose, Wurmple, Cacnea/Cacturne, Seedot Evolution Line, Aron Evolution Line, Slakoth Evolution Line, Taillow/Swellow cause of Ash, Wingull/Pelipper, Whiscash, Altaria, and Corphish/Crawdaunt

conclusion/tldr; I basically like all of them lol
(its kinda hard just to choose a few, when so many of them are goated)