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Success!! If in future, anyone ever Googles this thread, here was my big mistake. I was trying to use the action replay codes on an iso of the Japanese bonus disc. That was never going to work. If you want a Japanese Celebi, then get the bonus disc for sure, but if you're after an English language Celebi, look no further than your own US or PAL copy of the game. The action replay codes below unlock Japanese bonus disc that has been leftover in your copy of the game. USA Europe 5M54-WC2B-QHBG6 WNR8-RY3Q-29P6T GMNK-UQNE-QR78H WHZ0-EWPJ-12BTD NRTU-8KHF-1PZZ8 DEED-TK1H-U6N5P BHDF-N90M-BKMPV 3V7P-NZA1-ZBNVQ WNR8-RY3Q-29P6T GMNK-UQNE-QR78H WHZ0-EWPJ-12BTD NRTU-8KHF-1PZZ8 F57Q-1RNH-ZBAKF CNU4-TJFW-TR1W0 This is actually way simpler, as no hex editing is involved, no mucking around with different formatted memory cards. Just put in the AR code and presuming you've caught and purified all 48 pokemon, when you pick the shrine option on the right, Celebi will be sent to your party in the language of your save game (in my case, English). That said, the PAL version is insanely buggy. The cutscene is a rapid fire mess of empty text boxes. Not to mention the pokecoupons menu on the left. Next project is the Pikachu from the pokecoupons menu. Not sure if that will be possible due to how buggy the menu is, but I'll post my results if I have any luck!

Aaaand success! I don't know why but the first few times I tried the pokecoupon menu on the left I got the garbled menu screen you see below. Only after a exiting out and getting back in few times did I happen to get the proper menu screen in the middle screenshot. Just select the top option and select yes. I've no idea if it actually charged me any pokecoupons or not but it saved a pikachu to the empty slot in my party. A point of interest, after saving, it also came up with another yes/no option but I have no idea what I was choosing yes or no for. I selected no and it sent me back to the garbled menu. I also tried the second option (I can't read Japanese so I've no idea what it says, other than there's GBA in there) but it actually made the emulator throw up an error so not sure what that or any of the other options do. Anyway, hopefully someone will gain something from my hours of frustration. AR codes and your own US or PAL disc are all you need. By all accounts the US version is no where near as buggy, with actual translated text so if that's your version you may have an even easier time with the whole process.

I've made a compilation of every Certificate I've found from Google, Reddit, Imgur, LiveJournal, and Ebay Archives. https://imgur.com/a/sgUbzFq Sorry for not giving credits to the OPs, but you can find some sources if you use Reverse Image Search.

Can confirm that following the guide at https://3ds.hacks.guide/ isn't that hard. If you're worried about bricking your 3DS, loose ones aren't all that much on ebay. You could always buy a spare to be your hacked one. If you can get CFW going on a 3DS that will give you access to your Gen 4, 5, 6 & 7 saves so it really is worth it. Not to mention if you've still got saves from Gen 1 & 2, you can even send them to the Bank with a bit of tinkering. For Gen 3 you don't need to hack anything, you just need a flashcart. My personal recommendation would be the R4i Gold 3DS Plus (https://www.nds-card.com/ProShow.asp?ProID=575). It will also help you out greatly if you do decide to install CFW on your 3DS.

I don't use Citra emulator so not sure how that works with the savefile but your pkhex is set up for Sword/Shield. Maybe change the setting from Sword/shield to Pokemon moon?