How do I add an "activator" to a code & converting codes

I've read a few topics here and learned about "activators" (press L+R for blahblah, etc). But, how do I add one to a code?

Also, I read a bit about converting codes (for example, from US to EU and vice versa).
Is it true you do it like:
Take two of the same codes, one from US, one from EU.
US/EU code - other region code = difference
And then add or substract the difference from one of the codes to convert it.
Right?

Thanks in advance ^^

activators:

for buttons that are on the GBA (A,B,L,R,start,select, up, down, left, right), to add one the first line of the code would be something like:

Code:

---

94000130 XXXX0000

---

XXXX will be the activator code based on the button(s) selected to use. An easy thing for that would be downloading DSWorkshop, but you can also look at the bottom of this page of the wiki: here

NDS buttons (X and Y) have activators starting with:
927FFFA8 instead of the 94000130


at the end of the part activated by that (generally, but not always, the end of the code) you need to add a terminator:

Code:

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D2000000 00000000

---

that line needs no modifying, just put it in as is like that.

1. DS Workshop = W-I-N, put the code in the activators tab then select ARDS>GBA>buttons

2. Yes again DS Workshop = W-I-N it has a code porter

wiki.game-hackers.com

That is the only true W-I-N.

Thanks for your answers =D

So I tried out DS Workshop. Love the activator generator and code porter. However, it changed 221C0988 00000001 into 221C1588 00000001*square*.
What should I do with the square?

just ignore it

Ok, thanks.

But how do I port this code?:
620d0ba4 00000000
021c7ac0 000003e8
d2000000 00000000

As far as I know, the first and last parts aren't activators... or are they? I removing the first and last part, and then porting it, but that didn't work.

Were did you get this code?

Code:

---

620d0ba4 00000000
021c7ac0 000003e8
d2000000 00000000

---

You would convert the first half of the first 2 lines. The 3rd line is a terminator. Line 1 is a conditional and line 2 is a write. You convert the 20d0ba4 part and the 21c7ac0 part.

I found a few codes:

[A] Have 1000 HP
121c0648 000003e8

[B] Make enemy have 0 HP
121c4114 00000000

and

[C] Have 1000 HP in arcade battles
021c0608 000003e8

If I substract the first part of code A from the first part of code B, I get 3ACC. In order to make a code that makes the enemy have 0 HP in arcade battles, do I need to add 3ACC to the first part of code C?