What I mean by this is like giritina and zygarde
Might want to poke around the wiki.
Also a couple of guides around.
Collaborative Legendary Pokemon Guide
Edit: At a basic look, I’m not seeing anything pre-E4. Feel free to correct me, anyone, if I’m wrong; it’s been a while since I’ve done a new run.
Thank you this helped a lot!!!
You’re welcome. Have a good day!
You can get Giratina and Mew before the E4, but that’s it (Mew in Amphitrite city, Giratina in Throne Of the Hegemon inside the Void Gauntlet, both are late-game)