Rotom's Engine

Well, I used the IV modifier marking code, the nature modifier L/R on status screen code, and the EV marking code, so can you tell me which of these may have been the one to cause the Pokemon to be "illegal" for Wifi?

Oh, and for your other question, to make an IV either than 31 change the "1F" on the sixth line. KEEP THE "1F" ON THE FOURTH LINE. The last two numbers on the sixth line determine the IV for the IV marking codes. Hope this helped!

Sure, there are two options. As Allykat said, it's possible your EV codes added up to an illegal amount, likely due to some unknown prior effort points on the Pokemon. But also, as someone else mentioned, the Nature changing code does affect the PID, which will automatically mess up your Pokemon's legality. So you should breed/catch/SR for the nature you want, be careful if you plan to use the EV code, and never use the nature code.

And thanks for the tip about the IV modifier, that's great! I'll check it out soon.

Any non-marking IV, Nature, EV codes?

These marking codes tamper with the Pokemon's PID which makes them utterly useless when trying to build an online team.

Are you sure? Allykat claims that the IVs this gen aren't tied to the same process that determines the nature/gender/coloring of the Pokemon, so they don't mess up the PID. The IV marking codes should be fine. In fact, I tried this out by changing the IVs of some Pokemon on a Black cartridge, and I was able to get into a couple Random Matchup wifi battles with them. Unless Random Matchup doesn't use the same legit-checker that general wifi does, the IV codes seem to be safe.

That said, there must be someone who has seen or heard of an IV marking code that marks to a number besides 31. A few posters in this thread have tried manually editing the hex values, but they say it didn't make a difference. If anyone knows how to achieve a non-31 IV marking code, it'd be cool if they'd mention it here.

I've confirmed the following stat codes to work for Pokemon Black version, but they don't work on my copy of White version. They'll either have no effect on the stats or they'll freeze the game. Would anyone be capable of translating them to White version? Cheers.

Edit: Or, if easier, simply direct me to where a White version set exists?

That aside, I saw a list of EV modifier codes posted by ReignOfComputer on pokemongts.com. Correct me if I'm wrong, but I didn't see these codes anywhere here, so I'll post them.

Marking Codes

Mark the Pokemon in the PC to have the desired result(s).

Max HP IVs

020195B4 FC24F7E8

02001E00 73B4B4FF

02001FFC BDF8BCFF

02001E10 0024241F

02001E14 43A06928

02001E18 0024241F

02001E1C 61284320

Max ATK IVs

020195B4 FC24F7E8

02001E00 73B4B4FF

02001FFC BDF8BCFF

02001E20 0164241F

02001E24 43A06928

02001E28 0164241F

02001E2C 61284320

Max DEF IVs

020195B4 FC24F7E8

02001E00 73B4B4FF

02001FFC BDF8BCFF

02001E30 02A4241F

02001E34 43A06928

02001E38 02A4241F

02001E3C 61284320

Max SpA IVs

020195B4 FC24F7E8

02001E00 73B4B4FF

02001FFC BDF8BCFF

02001E50 0524241F

02001E54 43A06928

02001E58 0524241F

02001E5C 61284320

Max SpD IVs

020195B4 FC24F7E8

02001E00 73B4B4FF

02001FFC BDF8BCFF

02001E60 0664241F

02001E64 43A06928

02001E68 0664241F

02001E6C 61284320

Max SPE IVs

020195B4 FC24F7E8

02001E00 73B4B4FF

02001FFC BDF8BCFF

02001E40 03E4241F

02001E44 43A06928

02001E48 03E4241F

02001E4C 61284320

Again, all credit goes to ReignOfComputer

EDIT2: Nevermind, went out and found it myself. How empowering!