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I never thought of trying this before but I don't see why it wouldn't work.
If I use the RNG reporters Time Finder (Capture) to find a combination of IVs/nature for a captured pokemon and then edit the IVs/PID in Pokesav would the resulting pokemon pass all legit checks?
Since the RNG...
Not sure if this is the best place to put it but I am RNGing a Shiny Hasty Rayquaza in HeartGold and since the frame I am going for is 8000+ I decided to experiment with save states and talking to my pokemon.
Here are the details
Method K
Seed:06090223
Target Frame: 8258
Roamers pre-save...