Leaderboard

I've ran a few more tests with changing the number of badges obtained, entered the Hall of Fame, and made a new save to make sure it wasn't an issue with the save. In all of these tests as soon as I tried to release the second last Pokemon it would always come back. I'm thinking this is to try and prevent the player from missing out on double battles since the game stops you from entering a double battle if there is only one Pokemon on your team. Now I'm wondering if Pokemon Box or migrating Pokemon to gen 4 is able to mess with this restriction.

Double clicking the Relearn Moves box gives you the basic egg moves, and you can append on viable egg moves. This only applies to mons hatched from eggs. Egg Move transferring from Brilliant mons/egg moves mons sharing their moves don't seem to affect this.

While I'm unsure whether Emerald restricts the release of the last 2 mons (never tested it myself), it sounds like Poke J's tests were pretty conclusive. As for the mandatory last doubles 7th badge, I imagine this happens when you don't restrict the release of the last 2. (AFAIK, RS only restricts the release of the last mon, and the user in the video placed HM mons in daycare, and the Abra that was used to Teleport back to Mossdeep could be released with no issues [not HM, not last mon, cause 2 in daycare])

@Adilson Filho BR I've looked at your save and I think I know what is happening, but I'm not 100% sure. However, I think it has to do with that the 7th gym being a mandatory double battle and to prevent the player from getting trapped the game is stopping you from releasing your second Pokemon. I've tried adding Pokemon to the save and releasing different combinations of them and I always get stopped at the last two. So I recommend either leaving two Pokemon in your PC or remove them with PKHeX. So to answer your questions from what I think is happening: 1) Just make sure you have two caught Pokemon on your save and when you start using HMs make sure you have a Pokemon somewhere on the game that knows the move. 2) You just seem to have met the criteria the game has set out to prevent you from releasing Pokemon. See my answer for question 1. 3) No. 4) See above description, as well as, my answers for questions 1 and 2.

So I recently updated to the newest version of PKHeX (191209): on my Moon save all of the in-game trade Pokés from NPCs flag as illegal, stating that several OT memory indexes should be 0. It also seems to show the same errors on starter Pokés that I collected in-game in X, and simply copied to the save for my starter collection box. I don't know if this might have something to do with them being moved before the game would normally allow a trade, or if it is just another aspect of the apparent bug in the legality checker, so I've attached them as well. Previous build (191125) does not flag them as such. I've attached the pk7s. They should all be untouched. This is what it shows when clicking the red !. 066 - Macho - 89B8D4275974.pk7 761 - Bouncee - 5FE8648F4C3A.pk7 061 - Whirly - 0625266004AC.pk7 076-01 - Veler - 7EF1BFB89B70.pk7 650 - Chespin - 1E226BCEFD13.pk7 653 - Fennekin - FC04E93A0117.pk7 656 - Froakie - C4BA9569B302.pk7