Pokémon is a series made in Japan by Japanese people. It's only natural for something like this to be made in Japanese. You could certainly make a case for a lack of a multi-language dub being "lazy", but I'd have to disagree with that. It just doesn't seem worth to even ask for to me when the English voice actor for Iono would be at least as annoying as the Japanese one. But that's coming from a guy who can understand her "gibberish".
The people who usually dub this kind of archetype tend to not be quite the same level of high-pitched, high-energy that sets people off
They get close to the vibe but, probably helped mostly by being in your language, it's not as "striking". And sometimes the voice direction takes them in a slightly different direction to compensate.
Regardless I think it's probably not laziness and probably just more, like, budget or time. The English trailer voices in general, for all of pokemon's trailers not just SV and that extends to their Pokemon Presents stuff too, have just been not great. I get the feeling they don't have a big budget to, you know. Hire the VO, give proper direction, retakes, all that jazz.
And wouldn't surprise me if they were on a tight schedule for this. Who knows when they even got the videos, you know?
The entire english side has just been weird for a while, honestly?
The professor roundtable was fully subbed in English and had a partial dub but it wasn't even
acknowledged on the English side. Even if they didn't want to translate the website that went with it (something they also never do for any of the novelty websites....) the video's just right there....They didn't even acknowledge Wiglett so for 2 days we had this old school "pokemon revealed in japan, but nowhere else" deal until they posted the actual trailer for it.
The overview trailer had outdated footage both in terms of build quality and showing Pokemon not meant to be shown; not to mention that one point where you could see the english text just overlaid on japanese text that they didn't clean up.
They announce the Iono trailer, but they didn't present it as a grafaiai-styled or wiglett-styled gimmick, they definitely presented it more akin to the usual trailers. Meanwhile Japan set it up as an Iono Stream, sort of like how the roundtable was presented as a presentation from the one professor guy.
The Iono "trailer" goes up and then they don't post anything about it for like 30 minutes, even though the other social medias did. And when they do post it its just subbed, something they also don't generally do for trailers
Then the second trailer doesn't get a social media announcement notice at all, even though that's the one that actually has the information on the POkemon as well as more information about Iono. At least they posted it pretty close to presentation time.
My conspiracy hat feels like TPCi doesnt' especially care about stuff like this so they don't give a lot of time or money for it. "It's just small trailers, why bother" type of deal.