>>56076218Terastal seems to have taken from or have similar concepts to both Delta Species and Crystal Pokémon from Gen 2's Puzzle Continent*. All 3 have the gameplay gimmick of changing types and involve crystals somewhere in their lores, but each have their finer differences.
*Which may also be a misnomer as Bulbapedia is considering changing it to go by the JP name, Mysterious Continent, but that's a discussion worthy of its own thread.
>Crystal Pokémon (JP: Neutral Pokémon) are naturally Colorless regardless of the Pokémon's original typing, but can temporarily change into 1 of 3 types. Their movesets invovles a mix of the 3 types, each move requiring at least 2 different types. Only fully evolved Pokémon were seen as Crystal.>Delta Species Pokémon all possess a different type than their regular variants'. Moves require Energy of their new type(s), but they maintain the Weakness and Resistance of the original typing. Any species of Pokémon can be seen as Delta. Variants seen with Delta include ex and Star.>Type-Shifted Tera Pokémon can be seen as the opposite of Delta Species despite also possessing a different type; they maintain the Energy requirement of their original type, but change their Weakness and Resistance to the new type. Tera is seen as a variant of Pokémon ex.>Stellar Tera Pokémon do not change types at all, but do have a move that requires 3 different types.Delta Species can also be correlated to regional variants; they're initially discovered and/or specific to a certain region where what sets them apart from their contemporaries are the type and moves learned. Any species can be Delta or a regional variant and the new type is maintained through the evolution line in most cases (for Deltas, that's if you're looking at the lines in a specific set).
