Two ways to start the fight with Emil?

[HappyTragedies]

I finished every other endings (except Y) now and just recovered from the despair of C/D endings, decided to start doing some completeionist things. So I did some searching online and I'm a little confused now. I realized there might be two ways to start the fight with Emil? One from stealing stuff from his home and you get to fight him near his home. The other is to hit level cap and fully upgrade all weapons and you fight him in the desert. Is there any difference and can you do both, or are these even related? Do both lead to ending Y?

Any help would be appreicated, thank you!

[.V̉alvey]

They are 2 different fights and you need to do them both.
The fight at his house gets you a weapon, which obviously is required to have all weapons.
Then after upgrading it to max level along with every other weapon, you can start the quest for ending Y, which is the 2nd fight against Emil (kinda). Keep in mind that ending Y is missable, google how to get it and how to do the thief fight.

[HappyTragedies]

I see, makes sense now, thanks. Guides I found usually mention one or the other but not exactly how they are related. Does this have anything to do with what Emil sells in his shop?

[FurtivePygmy]

Make sure you bought everything you need. Otherwise he may never appear again even while selecting chapters (not confirmed).

Be advised to save before starting the sixth step in the same save slot or even better in a free one.
1. Steal a mask inside his lair.
2. (Optional?) Find and talk to him within the City`s ruins.
3. Hack his chest inside the lair.
4. Encounter and fight him near an entrance.
5. Upgrade all weapons. Proceed to the Commercial facility and meet him there.
6. Then proceed to the same place you fought a centipede-like machine with A2 near the Desert : Center terminal.
7. Defeat and let him self-destruct (this leads to Y)
8. Reload. Defeat him the second time and do the opposite.
9. ....
10. Profit!

[HappyTragedies]

So I guess it will make Emil's shop disappear after the quest. Should I have finished Emil's Memory quest first?

[FurtivePygmy]

Originally posted by HappyTragedies:

So I guess it will make Emil's shop disappear after the quest. Should I have finished Emil's Memory quest first?

I am not sure whether he will appear again or not as you switch to chapters after getting his ending. Try to complete the quest with lunar tears first. Not so hard as upgrading all weapons.

[『teokboki』]

Originally posted by HappyTragedies:

So I guess it will make Emil's shop disappear after the quest. Should I have finished Emil's Memory quest first?

You have to complete Emil's memory first before doing Emil's determination. and like what Hide said, do Ending Y first before completing Emil's determination. Doing the latter first will make ending Y unobtainable