Honorable mention goes to the Safari Ball, which we'll probably never see again outside of breeding from past games.
Kurt is just one old guy in Johto that can't physically make the required amount of Poke Balls for that sort of thing. On the other hand, Devon is a huge company that has the manpower, money, and reach to be able to sell their Poke Balls and other products in other regions. Of course, Kurt could just go to Devon or Silph or some other company and tell them how to make them, but he doesn't seem interested in making money off them or else he would have been selling them years ago. Plus, he doesn't seem like the type to willingly tell anyone, especially some company only interested in making money, how to do what he does.
Yikes; I didn't realize that the Safari Zone's normal accessibility might be phased out due to Game Freak's aversion/reluctance to implement Safari Zones/Safari Games past Generation 4... :/ Even though its "purpose" is somewhat specialized (which really shouldn't count - the Safari Ball is essentially a re-costumed Great Ball that is restricted to a certain area), I still feel that it should at least be made in Poke Marts, so as not to waste the cool camouflauge design.. :(
(Although,
Pokemon OmegaRuby/AlphaSapphire Versions, what the eff are you two games doing by hosting a Safari Zone without any proper Safari Balls? -_- At least make the experience
feel more like a Pokemon Safari..)
Great in-universe rationale for Kurt and the Apricorn Balls; it makes a lot of sense. Although I haven't properly played through any Johto-based
Pokemon games yet, Kurt does kind of look like a reclusive, "non-corporate" type of individual.. From a meta/outside-of-game perspective, though, I see no plausible excuse for the exclusion of the Apricorn PokeBalls aside from time (which really shouldn't be one, at least if one plans properly...sigh) or "Game Freak's artistic preference" (as a fan of the Apricorn Balls, this would be a very poor artistic choice, in my opinion). Sigh...I would just like my Electric-type Pokemon in Fast Balls (and so on with the other Apricorn Poke Balls), Game Freak; is that aesthetic feature too much to ask for? Sheesh..
(even though the Fast Ball is meant more for speedy/fleeing Pokemon rather than Electric-type ones, despite the Fast Ball's visual design..)
The Luxury Ball has been one of my favorites ever since its introduction in like, Gen III or so? It pulls off being sleek and comfortable without looking too obnoxious or pretentious. It's a shame though, much like Premier Balls, that there can hardly be a justifiable use for it considering most of the time it'll probably fail seeing as it would work exactly like an ordinary Poke Ball would.
Wow; I just realized that the Luxury Ball's catch rate is equivalent to a normal Poke Ball and that the Luxury Ball's "effect" is applied
after battle.. 0_o Yeegh...it's going to be tough catching Arceus in this thing (provided that we actually get a legitimate in-game wild Pokemon encounter or an in-game "captured-in-Luxury-Ball giveaway" for him and not an effortless event distribution).
--For context, Arceus is the currently only Pokemon that I will catch in a Luxury Ball, due to: the Luxury Ball's unique, ominous design, as well as the Luxury Ball's cool Generation 3 "releasing a Pokemon during battle" animation, and as a way for Arceus to have a higher, exclusive status compared to the "Mewtwo, Lugia, Ho-oh, Groudon, Kyogre, Rayquaza, Dialga, Palkia, Giratina, Regigigas, Heatran, Reshiram, Zekrom, Kyurem, Xerneas, Yveltal, Zygarde" legendary crew (all of whom I plan to catch in Master Balls due to aesthetics/preference).