Here's a comprehensive Download Guide for Pokemon TCG Pocket:
Platforms
Pokémon TCG Pocket is available on mobile devices, specifically:
•iOS: Apple's App Store
•Android: Google Play Store
Step-by-Step Download Guide: 
For iOS Users:
1.Open App Store: On your iPhone or iPad, tap the App Store icon.
2.Search for the Game: Use the search icon at the bottom of the screen, type "Pokemon TCG Pocket," and hit search.
3.Find the App: Look for the official game by The Pokémon Company. It should have the Pokémon logo and the correct title.
4.Download/Install: Tap "Get". If it's your first time downloading, you might need to enter your Apple ID password or use Face ID/Touch ID.
5.Open the App: Once installed, tap "Open" or find the icon on your home screen to launch the game.
For Android Users:
1.Open Google Play Store: Tap on the Google Play Store app on your device.
2.Search for the Game: Click on the search bar at the top, type "Pokemon TCG Pocket", and press enter.
3.Select the App: Identify the official game by The Pokémon Company. Check for the right logo and title.
4.Download/Install: Tap "Install". If you're not signed in with a Google account, you'll need to do so or create one.
5.Open the Game: After installation, tap "Open" or locate the app icon to start playing.
Alternative Download Options: 
APK for Android:
If you're looking for an APK file to download outside of Google Play (not recommended due to security risks), ensure you use a reputable source and have a New Zealand VPN active, as the game was initially soft-launched there. Remember, downloading from third-party sites can lead to security issues.
Post-Download Steps: 
1.Create or Log into an Account: Upon first launch, you'll need to create a new account or log in with an existing Pokémon Trainer Club or other supported account.
2.Select Your Starter Pack: Choose from Mewtwo, Charizard, or Pikachu to start your collection.
3.Complete the Tutorial: The game will guide you through a tutorial to familiarize you with the mechanics of deck building, battling, and collecting cards.
Troubleshooting: 
•App Not Available: If you can't find the app, it might not be available in your region yet. Check for X posts or official Pokémon announcements about a regional rollout.
•Installation Issues: Ensure your device meets the game's minimum requirements (iOS 13.0+ or Android 7.0+ with adequate RAM), and you have enough storage space.
•VPN for Early Access: If you're trying to play during the soft launch phase, using a VPN to connect to New Zealand servers might be necessary, but proceed with caution regarding account security and game terms of service.
Updates
Keep the app updated through your device's app store to enjoy new features, cards, and events as they are released.
Remember, the game's availability might be subject to regional restrictions upon initial release, so if you encounter any issues, check official channels for the latest information.