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giveitem_std has been renamed to giveitem so "Error bad instruction" means the command isn't a valid one.
Also no free space management is required for decomps! It automatically moves everything around to fit your new added stuff.
For a tutorial on setting up custom multi battles, take a look at Part 2 in this guide: https://www.pokecommunity.com/showthread.php?t=431486
Your problem may be related to not setting up a partner or their back pic id.
You can find changes made by searching for commits in the branch or browse through the commits list.
Here’s the first commit for custom multi battles: https://github.com/DizzyEggg/pokeemerald/commit/539b05ff73da122a34f9b806b3a134f986acc13e
Poryscript still uses these same commands with just parentheses to enclose the arguments, so it's well-worth maybe even slightly gearing your tutorial towards it as the main difference lies in easier conditional checking.
It is important to note that Emerald also has scripts for selecting starters via script similar to FRLG for the Johto starters that are given out when you complete the Hoenn dex.
If you'd like help, it's easier to obtain it in the Discord server. As some general useful information, you can use the command in MSYS2
git grep "<<<"
to find files that have "<<<" which are where the conflicts are.
As Lunos said, Decomps can offer a cleaner environment for creating hacks (just be sure to test them on mGBA or hardware still!). Bugs can more easily be debugged due to version control like git which creates a snapshot of the current state of the repo and you can go back to older snapshots too...
The very well-known tall grass fix found here had a minor bug involving the Cycling Road/Route 17 grass have the tall grass animation as well.
The problem was that it was looping back to comparing the grass with D1 as its behaviour byte right after comparing 03 for the tall grass. This...