While catching Pokemon in the Crown Tundra, I got a lot of use out of the level 90 Lanturn, Brightstar, from an old Sword playthrough. I gave Brightstar Thunder Wave to paralyze the opponent, and she has enough HP and defenses to tank most hits, so she's ideal against certain Legendaries and stonger Pokemon. Granted there were still times when Brightstar would be knocked out by the Legendary during the "Throw ALL the Dusk Balls!" phase of catching, but I always take the time to revive her afterwards and treat her to a curry in Pokemon Camp with lots of rare berries in it, because she's a member of my first full Sword playthrough team so I have a strong attachment to her and her teammates, and I hate the thought of her losing affection and happiness.