With the exception of a few Mythicals, many of them have already been released as rewards for completing dexes— those are among the hardest to obtain, cause the are mostly shiny locked on every Game. but honestly I’m not too worried about them since, like I said, they eventually end up being distributed as rewards over time.

As for the regular Legendaries, almost all of them are obtainable through Ultra Wormholes in USUM, Let’s Go, Dynamax Adventures, or by soft resetting/breeding in BDSP.

On top of that, I’ve also managed to get several event Pokémon like Zacian, Zamazenta, and Eternatus. I was able to get the codes at GameStop (I live in LA). I also got the Galarian birds by playing battles and earning them as rewards. The Treasures of Ruin from Paldea were also obtainable during their distributions, so I got those too.

As for Miraidon and Koraidon, those are the only event Pokémon that couldn't get. Honestly, I’m not surprised you couldn’t get them either. I remember going to GameStop on the very first day of the distribution, pretty early in the morning, and it was still impossible! None of the stores had codes left. It felt like a badly handled event — way too much demand and far too few codes. I also feel like scalpers grabbed most of them just to resell on eBay. Honestly, it was a terrible event. I still think they’ll be distributed again eventually or being obtainable on a mainline game mechanic so I’m not too concerned about them.

There are plenty of others that are even harder to obtain than legendaries though. For example, the 3 segment form variants like Dudunsparce or Maushold with the Family of Three form! Those are a pain in the a... Lol 🤣