https://www.serebii.net/attackdex-xy/aerialace.shtml
It's good to see that my previous comment about Kabuto learning Aerial Ace was addressed, but the page for Aerial Ace still says that Kabuto can't learn Aerial Ace in any Gen 6 game - even though it can learn Aerial Ace in Omega Ruby and Alpha Sapphire (just not in X and Y).
https://www.serebii.net/pokedex-sm/171.shtml
https://www.serebii.net/attackdex-sm/stockpile.shtml
https://www.serebii.net/attackdex-sm/swallow.shtml
https://www.serebii.net/attackdex-sm/spitup.shtml
My previous comment about Lanturn was not addressed. Refer to my previous comment for the full details.
https://www.serebii.net/attackdex-dp/dig.shtml
My previous comment about Hippopotas and Hippowdon was not addressed. Refer to my previous comment for the full details.
https://www.serebii.net/attackdex-dp/taunt.shtml
My previous comment about Kricketune was not addressed. Refer to my previous comment for the full details.
https://www.serebii.net/pokedex-dp/191.shtml
https://www.serebii.net/pokedex-dp/192.shtml
https://www.serebii.net/attackdex-dp/earthpower.shtml
My previous comment about Sunkern and Sunflora being able to learn Earth Power in HG/SS, but not in Platinum, was not addressed. Refer to my previous comment for the full details.
https://www.serebii.net/pokedex-sm/205.shtml
https://www.serebii.net/attackdex-sm/mirrorshot.shtml
https://www.serebii.net/attackdex-sm/autotomize.shtml
My previous comment about Forretress was not addressed. Refer to my previous comment for the full details.
https://www.serebii.net/pokedex-xy/201.shtml
https://www.serebii.net/attackdex-xy/hiddenpower.shtml
My previous comment about Unown was not addressed. Refer to my previous comment for the full details.
https://www.serebii.net/attackdex-gs/crunch.shtml
https://www.serebii.net/attackdex-gs/metalclaw.shtml
https://www.serebii.net/attackdex-gs/swordsdance.shtml
https://www.serebii.net/attackdex-gs/submission.shtml
https://www.serebii.net/attackdex-gs/skyattack.shtml
https://www.serebii.net/attackdex-gs/watergun.shtml
https://www.serebii.net/attackdex-gs/crosschop.shtml
Crystal-exclusive Egg Moves are not labeled as such in the Gen 2 Attackdex. To aid in the labeling, the list of Crystal-exclusive Egg Moves is as follows:
Ekans/Arbok: Crunch
Sandshrew/Sandslash: Metal Claw
Cubone/Marowak: Swords Dance
Chikorita/Bayleef/Meganium: Swords Dance
Cyndaquil/Quilava/Typhlosion: Submission
Hoothoot/Noctowl: Sky Attack
Murkrow: Sky Attack
Teddiursa/Ursaring: Metal Claw
Skarmory: Sky Attack
Phanpy/Donphan: Water Gun
Elekid/Electabuzz: Cross Chop
Magby/Magmar: Cross Chop
Just in case someone might misinterpret what I'm saying here, by "Crystal-exclusive Egg Move", I mean "Egg Move available in Crystal but not in Gold and Silver". Some of these moves are available in later generations.
https://www.serebii.net/pokedex-gs/054.shtml
https://www.serebii.net/pokedex-gs/055.shtml
https://www.serebii.net/attackdex-gs/crosschop.shtml
On that note, Psyduck gets Cross Chop as an Egg Move in Crystal (but not in Gold and Silver), but these pages say that Psyduck doesn't get Cross Chop as an Egg Move in any Gen 2 game.
https://www.serebii.net/pokedex-sm/011.shtml
https://www.serebii.net/pokedex-sm/014.shtml
https://www.serebii.net/pokedex-sm/266.shtml
https://www.serebii.net/pokedex-sm/268.shtml
https://www.serebii.net/attackdex-sm/harden.shtml
Similarly to the issue with Lanturn and Forretress, on the pages for Metapod, Kakuna, Silcoon, and Cascoon, Harden is listed twice, with one instance having it labeled as an "Evolve" move and the other instance of each move having it labeled as a move that is learned at the base level. Most Pokemon that have "Evolve" moves only have those moves listed once. This also has an effect on the Attackdex page for Harden - on Harden's page, it is stated that the four Pokemon all learn the move at Level 1, instead of learning it by evolving from their previous forms.
https://www.serebii.net/pokedex-sm/028.shtml
https://www.serebii.net/attackdex-sm/crushclaw.shtml
Sandslash can learn Crush Claw upon evolving from Sandshrew regardless of level in all Gen 7 games (please note that I'm only talking about the original forms for them here). On Sandslash's page, it is stated that Sandslash doesn't learn Crush Claw upon evolving from Sandshrew and instead requires a Heart Scale to learn, while on Crush Claw's page, it is stated that Sandslash does learn Crush Claw upon evolving from Sandshrew, but only in Ultra Sun and Ultra Moon.
https://www.serebii.net/pokedex-sm/291.shtml
https://www.serebii.net/attackdex-sm/doubleteam.shtml
https://www.serebii.net/attackdex-sm/screech.shtml
https://www.serebii.net/attackdex-sm/furycutter.shtml
Just like with the issue with Lanturn and Forretress, Ninjask has an issue with Double Team, Screech, and Fury Cutter. Specifically, on Ninjask's page, under "Sun/Moon Level Up", Double Team, Screech, and Fury Cutter are each listed twice, with one instance for each move having it labeled as an "Evolve" move and the other instance of each move having it labeled as a move that is learned at the base level. Most Pokemon don't have their "Evolve" moves listed twice and instead only have them listed as "Evolve" moves - in fact, Ninjask has its "Evolve" moves displayed only once under "Ultra Sun/Ultra Moon Level Up". This also has an effect on the Attackdex pages for each of those moves - on each move's page, it is stated that Ninjask learns the move at Level 1 in Sun and Moon, but learns it upon evolving from Nincada in Ultra Sun and Ultra Moon. That being said, there's another issue at play here - the only differences that I could find between the "Sun/Moon Level Up" list for Ninjask and the "Ultra Sun/Ultra Moon Level Up" list for Ninjask is the presence of the extra Double Team, extra Screech, and extra Fury Cutter on the "Sun/Moon Level Up" list, meaning that Ninjask actually learns the exact same moves by leveling up in any Gen 7 game.