Here's why:
* Pokémon are living creatures: In the Pokémon world, Pokémon are sentient beings. Killing them is a permanent action that cannot be reversed.
* Game mechanics: The game mechanics are designed to encourage players to treat Pokémon with care and avoid killing them.
* Moral implications: The developers of Pokémon games want to avoid the negative implications of allowing players to resurrect Pokémon that they have defeated.
Here are some tips for catching Thunderous in Pokémon White:
* Use the right Poké Balls: Ultra Balls and Master Balls have the highest catch rates.
* Lower Thunderous's HP: The lower its HP, the easier it will be to catch.
* Use status effects: A Pokémon that is asleep, paralyzed, or poisoned is easier to catch.
* Utilize status moves: Moves like Thunder Wave or Toxic can be used to inflict status effects.
* Use a Pokémon with the "Catching Charm" held item: This item increases the catch rate of all Pokémon.
* Be patient: It may take several attempts to catch Thunderous.
Remember, it's important to treat Pokémon with respect and avoid killing them unless absolutely necessary.