I have legitimate, serious problems about Poké Balls that isn’t about what’s inside or how they catch Pokémon.
In all medias the humans have Poké Balls, video games, animes, mangas, when they want to send out a Pokémon, they throw it. When they switch Pokémon (fainting, Volt Switch/U-turn, changing Pokémon, whenever), they call them back in their Ball, with the Trainer holding the Ball.
I have a couple questions about Balls:
First, why do we never see Trainers pick up their thrown Poké Balls after calling their Pokémon? It’s not like they are one-use items.
Second, why do Trainers THROW their Poké Balls when sending a Pokémon in battle? Why can’t they keep them in their hands at all times?
Third, Pokémon Eggs are kept in Poké Balls as soon as you get them. Where do those Balls came from? Do the Pokémon Day Care have boxes of them? And why are Eggs always inside Poké Balls in the games?
Fourth, so Beast Balls are one of the only Poké Ball type that has a decent catch rate against Ultra Beasts. This would make sense, as Ultra Beasts are creatures from another dimension and not (initially) acknowledged as Pokémon. Except, the Master Ball can also catch UBs without trouble. So… how does the Master Ball keep its perfect catch rate against UBs?
Okay, let’s go down the line.
Question the First:
‘cause it’s boring.
No, seriously, I think this is more of a media question than a worldbuilding question; why would you show a trainer going to pick up their thrown Pokéballs? Don’t waste the screentime or the animation budget.
Alternatively, well… maybe they were originally understood as single-use items, and some of that bled into the anime’s portrayal. Like, a lot of that stuff got blown out of the water very early on with rare and special Pokéballs, but considering that ordinary Pokéballs retail for roughly the equivalent of two US dollars and regularly break while trying to catch Pokémon, they might actually have been imagined as disposable at one point. Maybe you only bother to retrieve Great Balls or better. You could even imagine this as a whole thing in the Pokémon world, where trainers just leaving their broken Pokéballs lying around all over the place is actually a huge problem.
Question the Second:
‘cause it looks cool.
More specifically than that though, I think it’s deliberately evoking stances and throws from baseball (which is an incredibly popular sport in Japan) and thus emphasising that Pokémon training is a competitive sport as well as a lifestyle. I mean, look at Ash’s throws in the anime. Even in-universe, it’s actually plausible to me that they do it because they think it looks cool, not for any practical reason.
Question the Third:
Well, the anime has actually shown eggs given to trainers in protective glass capsules that come with a Pokéball attached. I don’t think there’s anything problematic about assuming that these are supplied by the daycare – again, Pokéballs are extremely cheap. Starting in Sword and Shield, hatched Pokémon come in balls of the same type as the mother, even if it’s a really special one like a Master Ball, but frankly that could just be an ordinary Pokéball that’s had cosmetic modifications; how would we know the difference? I mean, to us the actual effect is strictly cosmetic, anyway. As for eggs being kept in Pokéballs in the games… um, are they? They show up as a little Pokéball icon in the little in-battle graphic that shows how many Pokémon you have, but I’m not sure that means anything. Correct me if I’m wrong, but I can’t think of any other evidence for that.
Question the Fourth:
The Master Ball… sort of breaks a lot of things, and honestly I think the world is better off without it, both in terms of worldbuilding consistency and as a moral issue in-universe. Clearly it cheats somehow, and bypasses whatever it is that makes Pokémon difficult to catch. That’s a problem for me, because I think that Pokémon are caught only when they acknowledge a trainer’s strength and accept that they have something to gain from partnership. If the Master Ball doesn’t care about that, then it’s kind of awful and you should never use it (its original context in generation I as the objective of Team Rocket’s Silph Co. takeover, and possibly as a weapon against Mewtwo, is worth recalling here). So… I don’t know how the Master Ball cheats exactly and I doubt there’s a clear answer to that question; but I think it might work using fundamentally different principles to every other type of Pokéball, I think Beast Balls probably don’t bypass whatever is different about Ultra Beasts in the same way as the Master Ball does, and I don’t think I would want them to.