The Bound Ball (バウンドボール) series features squishy round Pokemon that are reminiscent of Pokeballs in their shape. The balls are about 4 inches in circumfrence and made of a soft foam material, much like a stress ball. They come in colorful gachapon balls but many are not found in their original packaging due to their age. They seem to only exist for Generation 1 and 2 Pokemon.
Some Bound Balls, such as Bulbasaur and Pikachu, were re-released in Europe under Hasbro, but were no longer squishy. Instead, they were firm, and when hit on the back, would talk.