Funny you mention that because the anime doesn't showcase a lot of double battles, either, and the anime is essentially supposed to be an advertisement for the games.I absolutely agree with the idea of more boss double battles.
I know I said this once but... it's disappointingly ironic how double battles barely get any presence nowadays even though Doubles is the official tournament format. Between both Sun/Moon and Ultra Sun/Moon, there's literally only one repeatable double battle (the Game Freak battle in USUM).
You'd think they'd want to show players what a fun, varied format Doubles is, but recently... it's like it doesn't exist. Even though Totem Pokemon were "Single vs Doubles" and showed many cool gimmicks... doubles were still very out of focus.