The official Pokémon website has announced that during the Pokémon Players Cup 25th Anniversary Invitational broadcast which takes place August 13th, 2021 to August 15th, 2021, two in-game serial codes will be announced.

Wolfe Glick's Coalossal - V1CT0RYENG1NE25 - August 14th, 2021 until August 16th, 2021
Secret Rare Quick Ball - 25THANNIVCHAMPIONS - August 14th, 2021 until September 23rd, 2021

Get Wolfe Glick’s Coalossal and a Pokémon TCG Online Secret Rare Quick Ball

Watch the Pokémon Players Cup 25th Anniversary Invitational livestream on Twitch.tv to claim these two great in-game rewards.

Be sure to tune in to the livestream of the Pokémon Players Cup 25th Anniversary Invitational when it's broadcasting on Twitch.tv/Pokemon from August 13–15, 2021. Not only will you see some of the best Pokémon video game and Pokémon Trading Card Game players from around the world competiting, but viewers will also be shown codes and passwords that will grant special in-game rewards in Pokémon Sword, Pokémon Shield, and Pokémon TCG Online.

Get Wolfe Glick's Coalossal

While you're watching the video game stream, you'll be shown a password that you can use to receive a Coalossal in Pokémon Sword or Pokémon Shield. Coalossal has proven itself to be quite valuable in competitive battles, as demonstrated by Santino Tarquinio and Wolfe Glick when they won the Pokémon Players Cup and the Pokémon Players Cup II, respectively. And yes, these two incredible players are also participating in the Pokémon Players Cup 25th Anniversary Invitational!

Santino and Wolfe's Coalossal both ran the same move set—Heat Wave, Meteor Beam, Protect, and Solar Beam—and each Coalossal had the Steam Engine Ability and Weakness Policy held item as well. However, the Champions differed in how they trained their Pokémon, with Santino opting for a speedier variant and Wolfe prioritizing Special Attack power. Modest has remained the most popular Nature in the Battle Stadium, so Wolfe's specific Coalossal is what you'll get from this distribution.

Get a Secret Rare Quick Ball

Viewers of the Pokémon TCG stream should keep their eyes peeled for a code to redeem in Pokémon TCG Online to receive a secret rare Quick Ball. This versatile card has been used to great effect in many different deck archetypes. In fact, it's so ubiquitous that over 98% of Pokémon TCG players in Pokémon Players Cup IV included it in their decks! No matter what deck you're running, you'll surely be able to put this card to good use.

Source: https://www.pokemon.com/us/pokemon-news/get-wolfe-glicks-coalossal-and-a-pokemon-tcg-online-secret-rare-quick-ball/