Most all data and properties of any given Pokémon can be edited under the "Pokémon" dropdown tab within Skytemple. From there, you can edit the data and properties of the individual gender forms of each Pokémon.


Please note that it is generally unsafe to edit the Pokémon and "Reserve" Pokémon past #551. These are actors within the game and editing them can lead to unintended consequences. Pokémon #537 - #551 however can be safely edited and used to add new Pokémon to the game.