Sick of dealing with idiots.
Magearna: Am I a joke to you?138: vs Guzma
139: Gladion finals
140: Exhibition/Torracat's evolution
141: Mohn rescue, but Matori hijacks the frequency starting the Rocket arc
142: Melmetal evolution... unless he evolves during the League
143/144: TR climax, Matori flees and Guzma's 'redemption'
145: Goodbye Shaymin(As tired of clickbait releases, I'd actually love one >.>)
146: 'Graduation' and Ash says goodbyes
147: Ash returns home and heads to Galar after Oak requests him to deliver a package
totally not flowers and chocolateto Professor Magnolia
Something has to come from Magearna. I'm pretty sure it wasn't introduced just to be inactive, unless it becomes activated in a side story episode.