He meant to create an Arceuus in PkHex there's no flag in pkhex for it atm
for the encounter code you could use 1ED (493) in the pokemon part of the code
p.s. that flag is for captured regirock iirc here's short notes I'm too lazy to type the whole thing its in the next few updates ofpkhex...
the people you've seen do it have finished their own scripts for the event. They were in 1.0.0 but unfinished now they are completely removed. Those people rebuilt that. The item is no longer in the game and before it was just an image.
From what I've messed around with instant isn't handled well. It makes the textboxes LITERALLY instant. As in they never show up. It breaks everything. Unless someone smarter than me can figure out a speed between "fast" and "instant", I think the answer is no, unfortunately.
Did not work for me in Yuzu.(always on) [I know what I'm doing so take this report legitimately instead of the average person who says it doesn't work and then just did it wrong]
Will try with press LS though because pressing does work, just holding doesn't.
I will try press before encounter...
I can't help any more than that, I'm sorry. I would guess some flags are still set that lock you into diamond (dialga spawning etc) Maybe you can look at PKhex and see what events are checked for you in Event Flag Editor button other than that, I don't know, I apologize my friend
I've been looking into designing a small casing in the back of it actually, trying to integrate another 2230 M.2 slot along with as small a USB-C dock I can find to sort of make a plug and play M.2->USB expansion myself