_Since there seem to be several, and the question is more or less asking for a (limited) list, let's make one! And let's make it a CW-answer to have everyone contribute._ _If you find another one, make it a separate answer to get voted on, then add it to this list._ ------ ### Jigglypuff The answer given in the episode, Jigglypuff as seen from above. [![an image taken from the Pokémon cartoon series, showing a man wearing a blue cardigan with a yellow 'P' in it, pointing to a screen showing a Jigglypuff seen from above, proving it to be perfectly round][jiggly_s]][jiggly] ### Voltorb One of the suggested answers in the episode. [![a Voltorb, a Pokémon that looks like a Pokéball (a sphere with its top half red and its bottom half white) but with eyes, although it's not perfectly round from the angle it's shown][voltorb_s]][voltorb] ### Foongus Foongus would be a trick answer like the one in the episode, since it only works when seen from above. [![a Foongus, a Pokémon that looks like a mushroom, with a pink button nose and two black eyes on its stem, as well as appendages protruding from that stem, as well as larger circular hood; the Foongus is creamy white except for its hood that looks like a Pokéball, half white, half red][foongus_s]][foongus] ### Ditto A Ditto is capable of transforming into any other Pokémon, so into any round one as well. [![a Ditto next to a Voltorb (the Ditto on the left), two spherical Pokémon, both ; with the Ditto having retained its own face with small black eyes as opposed to Voltorb's expressive large eyes with eyebrows above it][ditto_s]][ditto] ### Diglett A Diglett looks as if it could be quite round when seen from above, although it does have a nose that may poke out. [![a Diglett, a Pokémon that looks like a brown earthworm with black eyes and a pink nose; the Diglett looks as if it might very well be round when seen from above][diglett_s]][diglett] ### Ghastly A Ghastly is spherical as well, if we disregard its aura. [![a Ghastly, a Pokémon that looks like a black sphere with big eyes and sharp teeth like a vampire, floating in a purplish cloud, its "aura"][ghastly_s]][ghastly] [jiggly]: https://i.sstatic.net/vlFHx.jpg [jiggly_s]: https://i.sstatic.net/vlFHxm.jpg [voltorb]: https://i.sstatic.net/zMSAx.png [voltorb_s]: https://i.sstatic.net/zMSAxm.png [foongus]: https://i.sstatic.net/yaNSK.png [foongus_s]: https://i.sstatic.net/yaNSKm.png [ditto]: https://i.sstatic.net/oAuDX.jpg [ditto_s]: https://i.sstatic.net/oAuDXm.jpg [diglett]: https://i.sstatic.net/LLJan.jpg [diglett_s]: https://i.sstatic.net/LLJanm.jpg [ghastly]: https://i.sstatic.net/y3YlK.jpg [ghastly_s]: https://i.sstatic.net/y3YlKm.jpg