A possible concise summary is:
The user plays a modified version of Pokemon Shield where every Pokemon is a legendary, and tries to catch shiny ones for their team. They encounter various challenges and battles along the way, and eventually face the champion with a full team of shiny legendaries. They manage to win the game and answer the question: can they beat Pokemon Shield if every Pokemon is legendary?
Here are the key facts extracted from the text:
1. The text is a transcript of a video about playing Pokemon Shield with every Pokemon being legendary.
2. The player starts with a shiny Dialga as their starter and encounters many other shiny and non-shiny legendaries throughout the game.
3. The player loses a shiny Magearna to hail and fails to catch a shiny Virizion due to timer running out.
4. The player manages to catch a shiny Ho-Oh, a shiny Rayquaza, and a shiny Zygarde to complete their team of six shiny legendaries.
5. The player defeats all the gym leaders, the champion, and a Gigantamax Melmetal with their shiny legendary team.