Norex

You used the Lending function and a lended pokemon will always return in the same way it was given out. In your case you need to do a normal trade instead of a lending trade.

Its not a bug as synchronize only has a 50% chance to give you the desired nature. You are able to change the nature of legendaries with a Nature Reroll Ticket though.

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Larvitar sold 100k.

It will only try to evolve upon actually reaching the maximum amount of happiness during night time. To reach the max happiness again make your Eevee faint in a wild battle and then gain some happiness again during night time. Also happiness evolutions dont require a level-up and its just about reaching the max amount of happiness of 255.

The event sprites were only available in the years they released in.

You need a pokemon with the move Foresight for these.

What message do you get when you try to enter Alucards castle?

Check if you are able to enter Alucards castle or not. You only need to battle Horon to re-access the castle.

-1, PRO is using Gen7 mechanics and adding stuff from Gen8 would make it inconsistent.

Hey, its not a bug. You simply didnt check all locations careful enough. Make sure to double-check all locations shown below and look very closely as the blue pokeballs can be hidden under trees as well.

Its blue wings + blue glasses but...

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Buneary sold 50k. Mudkip sold 70k.

Yep, you may need to clear the first option before you get the other one.

Horon has 2 purposes. One is the mount reward and one is to reset the Dark Realm quest. Now that you have the mount you will have to battle Horon again after the cooldown to reset the Dark Realm for you.

To be able to enter the Gengar-Megastone quest you have to beat Umbra in the Dark Realm during the Darkrai quest. That is optional so you didnt do it the first time. You now have to beat Horon in the Dark Valley without letting one of your pokemon faint, then you will be able to re-enter Alucards castle where you can access the Dark Realm again after beating Alucard.

Yes, it changes the OT name of every pokemon of yours in existence.

Hey, its not a bug. You simply are missing some locations because following a guide blindly is not always ideal for quests as there can be randomized parts for each player or changes after some time. Make sure to double-check all locations shown below, look very closely as the blue pokeballs can be hidden under trees as well.

Different pokemon have different base-EXP, thats a basic mechanic in pokemon. Baby XD001's base-EXP is not publicly known though as it doesnt exist in any of the original games. You can read more about it here: https://wiki.pokemonrevolution.net/index.php?title=Experience_System

If you went out of the Dark Realm for any reason and want to re-try it you have to reset it by beating the Horon boss in the Dark Valley. Make sure to defeat him without letting on of your pokemon faint, doing that will allow to re-enter Alucards castle in Necropolis where you can beat him again. Make sure to defeat Alucard while having a pokemon that knows the move Miracle in your party and you will be send into the Dark Ream again where you do the quest again.

Grats, nice achievement

Thats not a bug as you lose your flying type in the turn you use Roost.