The restrictions include a level restriction, where the Pokémon can be only between level 25 and 30, with a combined total on the three-Pokémon battle team of no more than 80. No Pokémon that can not be obtained before or between these levels are allowed either, and Mew is also restricted. Evolved Pokémon are disallowed as well. There is also a height and weight restriction, as Pokémon must be shorter than 6'8" (2m) and lighter than 44 lbs (20 kg) to compete. With these restrictions, only 45 Pokémon are able to be used in the Petit Cup.
In the Generation IV handheld games, there is a nearly identical cup called the Fancy Cup.