In EP056 - Pokémon Certification Test in the original Pokémon anime series, there's an infamous scene where the main characters are asked a trick question.
In the scene, the characters are taking a Pokémon test where they are challenged to recognize Pokémon by identifying silhouettes:
Please name the Pokémon by identifying its silhouette (or any part of its body) as it's displayed here
One of those silhouettes is of a ball. The characters come up with some reasonable guesses - a Voltorb, Pokéball, or Electrode - but it is revealed to be a Jigglypuff seen from above:
When this episode came out, there were only the original generation of Pokémon. Since then, many more have been released.
If the question was asked with every Pokémon in existence today, would there be any additional valid guesses to this question? That is to say, does there exist any other Pokémon whose silhouette could be a perfect circle from at least one angle?