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So I was able to narrow down all my Pokemon to around 1800 and are in several locations and backed up. Now it is a matter of getting all Ultra Moon Pokemon back into Ultra moon and respectively with Moon. And I'll create the save files for Sun and Ultra Sun onto my 2DS and export it onto my SD card so I can import the remaining Pokemon and all the events I have missed. Thanks again for you help!

Oh geez! Thank you both for your help! I'll try this after my class tomorrow and will let you know how it goes!

I've created an events channel on our own discord, so could just go straight there

This is definitely better, ^ recommended!

The string of characters that follow. Looking at the string may give you an idea of how similar the entries (within the same species) are. For example, these 2 Rattata are clones of each other, the only difference being one has a third move Bite. As you can see, most of the trailing digits are the same. This method may be laborious, but it's the only one I can think of right now. Additionally: Also, if the exact copies already exist in the folder you're trying to dump to, PKHeX wouldn't export them. This would help to reduce the amount you need to check, as PKHeX don't export out exact copies/duplicates when they already exist. edit: When I say dump boxes, I'm referring to this function in PKHeX: Also, remember when you're doing the "string comparisons", the files have to belong to the same generation. (compare PK5 to PK5, compare PK7 to PK7 etc)

if you use PKHeX to dump the entire box into a folder on your PC, you should be able to compare if there's duplicates, based on the checksum of the file. (it's in the file name). If I'm only mistaken, this would only work for exact copies tho. (down to the level, exp, moves etc)