Here's why:
* Daily Encounters: The Pokémon that appear in the "Pokémon of the Day" encounter are specifically designed to be unique and change each day. This encourages players to check back regularly and try to catch different Pokémon.
* Resetting: The daily encounters reset at midnight, ensuring that you get a fresh set of Pokémon to encounter each day.
However, there are ways to find similar Pokémon:
* Different Locations: You can find similar Pokémon in other areas of the game, even if they are not the "Pokémon of the Day".
* Breeding: You can breed Pokémon to get different variations of the same species, including different abilities, natures, and IVs.
So, while you can't catch the exact same Pokémon twice in a day, there are still many ways to encounter diverse and interesting Pokémon in the game.