However, you can get Squirtle through the Mystery Gift feature:
1. Connect to the internet: Make sure your Nintendo DS is connected to a wireless network.
2. Access the Mystery Gift option: Go to the main menu, then select "Mystery Gift."
3. Select "Receive Gift" and "Via Nintendo Wi-Fi Connection": This will scan for any available gifts.
4. Download the gift: If a Squirtle distribution event is active, you'll be able to download it as a Mystery Gift.
5. Talk to the receptionist: After downloading, go to the Pokémon Guild and talk to the receptionist to receive Squirtle.
Note: Squirtle distribution events are rare and usually tied to specific promotions or events. Keep an eye out for announcements from Nintendo or Pokémon related websites to know when a Squirtle distribution is active.