PokéBase - Pokémon Q&A
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As stated on Bulbapedia about the Move Reminder:

From Generation VI onward, any Pokémon hatched in Generation VI onward may also be taught any move it knew when it hatched; this includes Egg Moves, level-up moves bred onto a Pokémon, and Volt Tackle bred onto Pichu. Also in these games, Pokémon obtained via Mystery Gift can learn any specifically flagged move it knew when it was obtained...

I have several competitively-bred Pokemon in my copy of Sun, and I like the insurance of being able to re-teach their Egg moves should I accidentally delete them, or want to swap them around. However, I want to transfer the Pokemon over to Ultra Moon to teach them tutor moves.

I'm unsure if transferring the Pokemon to a different save file would cause the game to 'forget' about the moves the Pokemon got from breeding (thus not offer them to be re-taught if I deleted them accidentally). So in other words, does the game retain knowledge of the Egg moves the Pokemon had when it hatched if it is no longer in its original save file?

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ill try this later on sun and ultra sun copy :D
It might be useful for anybody reading this thread to know that transferring a Pokemon -- at least, between Gen 4 and Gen 6 -- will cause forgotten event moves to be unteachable. This is based on an anecdote from this question: https://pokemondb.net/pokebase/334466/
Knowing this, I'm even less satisfied the answer below is accurate, even though my question only concerned Egg moves and didn't concern Gen 4. If anyone could provide clarification, I'd appreciate the peace of mind.
I'm going to answer this correctly soon with my own test I'm surprised no ones done this yet

2 Answers

3 votes
 
Best answer

Answer

  • Pokemon bred in Ultra Sun and Ultra Moon are able to remember Egg Moves in the opposite version.
  • Pokemon bred in Sun and Moon are able to remember Egg Moves in Ultra Sun and Ultra Moon.
  • Pokemon bred in Sun and Moon are almost certainly able to remember Egg Moves in the opposite version.

Setup

If you’re interested in my process, this is where I get into the actual experiments.

There’s a few different combinations of trading that I thought could affect the way the games read Egg Moves. Because of this, I came up with four separate tests:

  1. Trade Ultra Sun to Ultra Moon
  2. Trade Ultra Sun to Sun
  3. Trade Sun to Ultra Sun
  4. Trade Sun to Moon

These four should account for all variations between the games, thanks to each version interacting with the others in some way.

The Pokemon I decided to use was Slowpoke with Stomp, an Egg Move it can inherit from the Rhyhorn family. These Pokemon were somewhat arbitrary – this test will work with any breeding pair. If you’d like to replicate the exact process I used, you’ll need a Rhydon with Stomp and a random Slowpoke of the opposite gender.

Experiment One

The first thing I did was breed the Slowpoke and Rhydon in Ultra Sun, hatching a Slowpoke with Stomp.


This is a photo of the Slowpoke sent to Ultra Moon (“UM Trade”) immediately after hatching it in Ultra Sun. As seen, it has inherited Stomp from Rhydon.


This is a photo of the Slowpoke after using the Move Deleter to remove Stomp. After this, the Slowpoke was traded to Ultra Moon…


And taken to the Move Reminder…

Success! We can confirm that Pokemon bred in Ultra Sun and Ultra Moon will be able to remember Egg Moves in the opposite version.

Experiment Two

Just like Experiment One, this test begins with hatching a Stomp Slowpoke in Ultra Sun. S Trade, pictured below, will be going to Pokemon Sun – but otherwise, this test is the same.



And just like that, we can prove that Pokemon bred in Ultra Sun and Ultra Moon will be able to remember Egg Moves in Sun and Moon.

Experiment Three

In this experiment, we start the breeding process in Sun. Here we breed another Slowpoke with Stomp so we can trade it to Ultra Sun – named, of course, US Trade.



Expectedly, we can prove that Pokemon bred in Sun and Moon are able to remember Egg Moves in Ultra Sun and Ultra Moon.

Experiment Four

We breed another Slowpoke in Sun, name it M Trade, prove it has Stomp, delete it, and send it on its merry way.

…or we would, if my Moon cartridge had gotten to that point. Unfortunately, because I don’t have a Moon file up to the Move Reminder, I can’t conclusively prove that a Pokemon bred in Sun will remember Egg Moves in Moon, or vice versa. However, judging by the previous three experiments, I have no reason to believe the answer would be different.

Conclusion

These tests are easy to replicate, if a bit tedious. I'm happy to answer more questions about the process, but I think I covered everything. Thanks for reading!

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This is the most fleshed-out answer I've ever seen. Upvoted.
Really appreciate it, thanks. I might come back to do the fourth test if I can ever bother to complete Moon :P
1 vote

Yes, the egg moves should be able to be remembered after the transfer.

But there is a way around this altogether. Reteach them the egg moves now, then transfer them. Now teach them the tutor moves. Therefore you won't need to worry about them being lost forever because they never left the Pokemon they needed to be on.

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Did you test this yourself? I am curious how you found out.
BTW I know I can re-teach moves in Sun; the concern is if I deleted them after transferring them. If initially transferring them to UM caused the game to ‘forget’ the Egg moves, I assume transferring back to Sun afterward wouldn’t help either.
You basically answerd this yourself, it says "Move Reminder can also teach Egg Moves and special moves it had previously forgotten." Quote, any move it has previously forgotten. So you will be able to remember them even if they are deleted.
And no, I have not tested this myself because I don't have bank, but, my friend who has used it confirmed for me that you won't lose them. (:

https://bulbapedia.bulbagarden.net/wiki/Move_Reminder
I know. I’m concerned with whether the game actually retains that data on what moves were ‘previously forgotten’ when you trade or transfer Pokémon. I read the article and decided it wasn’t particular enough to this issue for me to be sure. It’s why I asked to begin with.