We all know it's possible to capture Arceus, but I wanted to write a route that would allow the player
to easily change the capture location of that Arceus.
Arceus' script moves you up, which can cause us to be moved into a new map id in the void.
By manipulating what map is above the map we call the script in, we can modify Arceus' capture location.
The route I came up with achieves all of the following:
You can choose any ingame map, or '———-' as capture location
You can recapture Arceus infinitely
You can modify the capture location inside the void to capture Arceus from all locations ,
with only a few seconds of work. Not requiring leaving the void.
You can shinyhunt it
The way I achieved this is using Itemdata. Once again I made a video with an indepth explanation:
This post will go slightly more indepth than the video, although not much.
First off all Jagger found the addresses for Itemdata, which were needed to know the amount of steps I had to
take to reach my items.
Base + 0x00838
We start in the void at Matrixdata being located at
Base + 0x022ADA
I then made a simple calculation to convert these values into amount of steps between them.
First we need the amount of bytes between two addresses.
(0x022ADA-0x00838) = 0x0222A2
= 139938 bytes
Then we convert this to amount of maps we will travel through. Going vertically, maps 60 bytes appart.
= 2332 maps
Then we convert this to amount of steps, knowing that one map is 32x32 tiles.
2332 maps *32 steps/map
= 74 624 steps
Since Itemdata is located higher in RAM, we have to travel north.
This calculation is based on the start of Itemdata, but we only have to travel to about the middle of it for our setup so its a little less.
Now that we have a general idea of the amount of steps, I need to know what maps we need to write.
We can write maps here using Item ID's and Item amounts. Both are stored in 2 byte values.
The maps we need are:
[li]ID 251: Outdoor Pal Park. This is needed to get the menu to capture Arceus, and to open a shop (explained later)[/li]
[li]ID 510; Hall of Origin. This is where we call Arceus' battle script.[/li]
[li]ID 393: Indoor Pal Park. If you haven't entered this map at least once, Proffesor Oak will meet you.
Once we leave the void using RETIRE in pal park, the mapscript for Oak Will trigger. The game will skip a different mapscript required to move us down, resulting in us being stuck.
[li]ID 137; Veilstone Department store: This map's 4th script opens a shop, using the RETIRE menu its accesible.[/li]
[li]and then a 2 byte value we can write anything to, so Item amount. highest map being ID 558[/li]
My first route had big flaws, it was pricy and wasn't really well set up. cost nearly 900K .
My second route is nearly flawless, the price for setup is only 80 860 !
Next to that, I was able to write all needed maps within 64 steps of each other.
You'll see that the setup actually is very lucky when I explain it.
First of all, I needed cheap items. I also need two cheap items to be 60 bytes away from each other in RAM,
since that's the same as going one map up. the other maps are only 2 bytes away from each other, next to each other horizontically.
Everything fell perfectly into place!
Grass Mail x1-558 -Not only is this item the cheapest in the game at 50, it's ID is 137. meaning it's ID can be used for the Veilstone
Department store, whilst its amount can be used for the map to catch Arceus in. And next to that, if it's the first item in Mail slot it'll be 60 bytes above the 4th item in your Medicine slot. This comes in later[/li]
[li]Heart Mail x393 - This is equally cheap at 50, and is horizontically next to Grass Mail in the void. We can trigger Oak's cutscene here, then
we can toss 142 Heart items to get 251 left. Then we can get our Pal Park menu in here.[/li]
3 Filler Items x any amount (just to align 4th item with Grass Mail amount)
Antidote x 510 - Antidote is the second cheapest item at 100, and with the 3 filler items we have now written Hall Of Origin underneath
the Grass Mail.[/li]
With only 3 Item setups and 3 filler items all our maps have been written.
Now one problem came up, we want to modify Grass Mail's amount by tossing items to change our Arceus' capture location.
Issue is, in Pal Park mode you can't acces the bag!
To fix this, we needed the map 137 (Grass mail's ID). We can use RETIRE here to call the shop menu and sell grass mails until we get the desired amount.
So a clean version of the item setup is as following:
Grass Mail x558
Heart Mail x393
3 Filler Items x any amount
Antidote x 510
Now before I show the route, I'd like to note that the following values shouldn't be used as item Id's or amounts
in your bag, especially the amount of grassmails, since they can cause softlocks, move you or kick you out of the void.
Red; Dangerous, crashes and softlocks
5, 23, 31, 32, 35, 85, 88, 91, 93, 95, 105, 114, 115, 133, 150,154,155,156 176, 178, 180,
182, 184, 188, 255, 304, 337, 461, 516, 352
Yellow; Cause movement and or warp you
117, 177, 179, 181, 183, 185, 186, 187, 192, 393,
474, 475, 476, 477, 478, 479, 480, 481, 482, 483,
484, 485, 486, 487, 488, 489, 490, 496
I would also like to note that you can only capture Arceus once in Hall Of Origin.
Next to that, we can modify its location to become '———' by using maps without assigned capture location,
for example map 251, Pal Park.
Have received a pal pad from pokecenter lowest floor
Have a bycicle
Have enough pokeballs
Pokemon with fly or teleport
Next to that, I slightly changed the usual 'go north' path by going 64 W first. This makes the path less likely to go through
dangerous maps. Here we go!
[font=georgia]1) Get to itemdata and encounter Arceus
If oak cutscene plays: 1 W
Toss Heartmail x 142 (now you have 251)
Following steps can be repeated, always starting at just having caught an arceus.
Now you can:
2) Change location to catch arceus in
RETIRE (this opens up a pokémart buy/sell option)
Sell grass mail until it becomes desired map ID
3) Re-encounter Arceus in same map (can also be done after 2)
repeat this step infinitely
After catching last arceus: