I'll explain what I said in the title. Basically, Pokemon in the games Sw/Sh and/or BDSP that are also in Pokemon: Legends Arceus don't have the Egg Move Compatibility pages show up when you click on them. I did a couple of tests to make sure this was happening due to Pokemon: Legends Arceus.
1# Rowlet's Gen 8 Egg Move Compatibility Page Rowlet is a Pokemon in Sw/Sh and Legends Arceus. When you click on its page, it will say, "Rowlet does not have any egg moves" despite having egg moves in Sw/Sh.
2# Roselia's Gen 8 Egg Move Compatibility Page Same case with Rowlet. Roselia is in Sw/Sh and BD/SP as well as PLA and the pages says Roselia doesn't have egg moves even though it has egg moves in Sw/Sh and BD/SP.
I should also mention this also happens for Pokemon who have a Hisuian form in Legends Arceus. For example,
Qwilfish has a Hisuian form, yet the Egg Move Compatibiliy Page for Johtonian Qwilfish is missing.
Yes, I'm completely aware that there is no breeding in Legends Arceus. However, there is breeding in the games Sw/Sh and BD/SP. It makes zero sense for a Gen 8 Egg Move Compatibility page for something like Roselia to not show up simply because Legends Arceus exists. Shouldn't the egg move pages for Pokemon in Sw/Sh and/or BD/SP as well as PLA simply show up the Egg Move Compatibility Page for Sw/Sh and BD/SP without having to factor in Legends Arceus? (Might as well link Fizz's post about Egg Move Page distinction so that could get fixed as well)