As a person who missed out on some crucial events, what is the best way to get them 100% legally and legit? Not through giveaways or Wonder Trades, I'm talking about the next best thing outside of the actual event itself.

Is PkHex a good source? I see there's an event database but the dates are sometimes wrong, and I feel like there's more evidence that the Pokemon arent legit that I can't see/others would be able to see. I want to make it look as clean as possible. For the database do they just copy actual event Pokemon? How good are they from a legitimacy standpoint? Do I just change the dates?

What do?