How was I able to catch version and postgame exclusives in Dynamax Adventure?

So, I started playing on a different account from my main, so I can play through the Crown Tundra and Isle of Armor and Main Story again. However, on my first run-through of the Dynamax adventure, I encountered and caught a Pheromosa. This is an Ultra-Beast, and according to my research, not able to encounter untilafteryou complete all 3 main legendary clues. So how was I able to encounter it and catch it under these circumstances. A similar thing happened with Groudon. A Sword exclusive not encounterable in Shield, the game I am playing through right now. So again, how wasI was I able to encounter it and catch it?I got the info of it being version exclusive from Bulbapedia, so Bulbapedia might be incorrect on that, but I am pretty sure you can’t encounter Ultra-Beasts until you complete the main 3 Legendary Clues. If it helps anyone, I have this information:

Is this a glitch or what?

Pleaselog inorregisterto add a comment.

You were likely playing onlineIf you are playing online, you can join other people’s dynamax adventures. This includes people with Ultra Beasts and the other version.

Source:Experience (and alsothis)Hope this helps!

From my experience and several sources which I will list if you want me to, the first two Pokemon you find in a Dynamax Adventure are Suicune (1st) and Tapu Koko (2nd). Also, like you said, you need to beat all 3 legendary quests to find the Ultra Beasts. The Groudon in a Pokemon Shield Dynamax Adventure is the Cherrim on top; all this evidence points to the fact that your game is glitched, or that someone broke into your house late at night and modded your game.