The Level 20 Scratch Cat Pokémon comes with the moves Screech (Normal-type), Bite (Dark-type), Fake Out (Normal-type), and Happy Hour (Normal-type), which doubles the amount of prize money received after battle.
The serial code that you will be required to enter is HAPPY, although it is so far unclear as to why the distribution event is running.
Once entered, you will be greeted with the message: “Wow! It’s a Meowth! The notorious Meowth is here! This special Meowth knows the move Happy Hour, which doubles the prize money you receive after a battle.”
How To Unlock Happy Hour Meowth With A Serial Code
1. Select Receive Gift, then Yes to confirm
2. Select Get With Code
3. Select Yes to confirm
4. Enter the serial code HAPPY, then watch as you receive your Pokémon
5. Speak to the delivery girl in any Pokémon Center to receive the Pokémon
6. Be sure to save your game!