It's possible to have the code for other pokemon (shinx, Horsea, Kangaskhan, Comfey etc ...) ?
Yes, its simply a matter of editing the 2nd code to match the National Dex # (which is in Hexidecimal).
Does anybody know how to 999x "Max Mushrooms" and "Armorite ore" in Shield? I tried ... 999x pickup/unhold items
The Pickup / Unhold works for these items perfectly fine. Just remember those codes are VERSION exclusive so the Sword code does nothing/crash Shield and vise-versa.
Fast breeding codes always crash my game. Other codes work fine.
Once again, most codes (including those ones) are version specific. If you are crashing, either your game version (Sword vs Shield) is incorrect OR the game's software version (this thread is for v1.2.1 codes ONLY) is incorrect.
Hold L/R to clear & create a purple beam doesn't work.
This is either the same issue as above... you are using the incorrect
cheats. Also, since the code doesn't clear the active Raid... this can also be an issue with you not clearing enough Active Raids to add another to the Wild Area you are in. The Wild Areas (Mainland, Isle of Armor, & Crown Tundra) each have a cap for the # of active Raids which the game will display. There is a max of 1 Wishing Piece Beam and a max of 1 non-Wishing Piece Beam which is Purple per Wild Area.
The code was programmed to allow a player to replace the current Raid Beam at a Den with a Purple Raid Beam (aka when the Raid at that Den is Red.) It was not designed nor can the game due to it's caps handle you adding more than a single Wishing Piece Raid Beam to the map.