>>54010094>>54012790Pokemon/Capsule Monsters was also heavily inspired by Dragon Ball (and possibly other Toriyama works). You can see this very clearly in early concept art and some Pokemon designs like Rhydon. Lance also used to look like Vegeta.
Anyway, let's not digress. The point I was trying to make is that the concept of Capsule Monsters might very well be based on Capsules in DB, which can store huge, non-organic objects in tiny pods. It's based on the same principle of storing something big in a small container by shrinking it in some way. The small containers can be carried around until you press a button to "release" the content.
Pokeballs do pretty much the same, except it's not as clear if it's magic disguised as technology or an ability that all Pokemon have, while in DB it's stated to be technology that the Capsule Corp. developed.