Yeah a shame really, Lillie's mentor ironically seemed to be one of the few COTD of the series. A pity because I kinda liked the rival setup this series, with most of them specialising against a specific Pokemon of one of the protagonists. All of Ash's rivals develop a specific Pokemon of his.
There was a good balance between laid back character based stories and competing/rivalry based ones for Sophocles and they all sort of merged nicely together in this week's episode. Granted barely any of it was battling which is likely gonna make his league limelight a bit of an anomaly within what was otherwise a pretty consistent run.
Also another plus point, Vikavolt still has a personality. I was worried he'd get the same demotion as poor Sylveon after evolving, being relegated to his ball unless he was needed, so it's nice to still have some character moments between him and Sophocles. Kinda strange he's more like a big frisky mutt now, though I suppose there's some logic, as Charjabug he was constantly crawling about, just being in the form he was in, it didn't look like much.
Strange how SM has done pretty well making the less conventional Pokemon like Turtonator and Charjabug/Vikavolt rather likeable while some of the usual marketable ones like Snowy and Popplio have struggled to maintain a personality.