At the end of PM2023 14, which aired in Japan on July 21st, 2023, a serial code for Friede's Dark Tera Type Lizardon, which was featured in this episode, was announced. The code was: DARKTERA0006 and was usable from July 21st, 2023 until September 1st, 2023 at 8:59 JST. The code was also announced on Monday, July 24th, 2023 around the world and tied in with an Obsidian Flames TCG promotional video.

YouTube Clip - Obsidian Flames | Special Charizard Distribution in Pokémon Scarlet and Pokémon Violet

Source: https://www.youtube.com/watch?v=p4-FOvO4ukY

Receive a Dark–Tera Type Charizard in Pokémon Scarlet or Pokémon Violet

Charizard is appearing as a Darkness-type Tera Pokémon ex in the Pokémon TCG! Celebrate with a Dark–Tera Type Charizard distribution in the Pokémon Scarlet and Pokémon Violet games.

Tera Pokémon ex are appearing as different types than usual and a Darkness-type Charizard ex is plunging the Pokémon TCG into a pitch-black blaze! Celebrate the release of Scarlet & Violet—Obsidian Flames and witness the beauty of Terastallization with a Dark–Tera Type Charizard you can receive via Mystery Gift in Pokémon Scarlet and Pokémon Violet! You can add this Dark–Tera Type Charizard to your team until Thursday, August 31, 2023, at 4:59 p.m. PDT by following these instructions and using the password DARKTERA0006!

1. Launch your Pokémon Scarlet or Pokémon Violet
2. Select Poké Portal on the X menu.
3. Select Mystery Gift, then select Get with Code/Password to connect to the internet.
4. Enter the password DARKTERA0006.
5. Watch as the gift arrives in your game. (Pokémon will appear in your party or in your Pokémon Boxes.)
6. Be sure to save your game.

Get a first look at Darkness-type Charizard ex below, then prepare to add this powerful card to your collection when it arrives in Scarlet & Violet—Obsidian Flames on August 11, 2023.

Lizardon Details:

Level: 50
Ability: Blaze
Tera Type: Dark
Moves: Crunch, Flare Blitz, Acrobatics, Belly Drum

Sources: https://www.tv-tokyo.co.jp/anime/pocketmonster2023/present/index03.html
https://www.pokemon.com/us/pokemon-news/receive-a-dark-tera-type-charizard-in-pokemon-scarlet-or-pokemon-violet
https://www.pokemon.co.jp/sp/dark_lizardon/