I'm trying to get the gift. Ok so basically with shinies I find my seed, get to that frame and then advance the PIDRNG. Do I have to do anything with the full seed on the main RNG page?Which Larvesta Egg are you referring to?
If you are breeding for it - the method you would use would be Breeding (BW) (or BW International if using international parents).
If you are referring to the Egg received ingame - that uses the Larvesta Egg method.
For a bred Larvesta: You want to follow the breeding guides linked in the third post (or also just above this post!) - there's a whole lot of information there about how to breed for IVs, gender, ability, shininess. (You can also now use the Shiny Egg finder in RNG reporter, which is briefly detailed in this guide.)
For a gift Larvesta: As there's no inheritance etc. to worry about this is the same as any normal RNGd pokémon - look for a frame with the desired IVs and a nearby shiny frame, then advance the PIDRNG using a Chatot - I seem to recall a moving NPC in there though, so some frustation may ensue.
Is the poster above correct with having the max frame to search at 200?
Also how do O get the right nature? Is it set for the frame that'll be shiny? Which means I have to find a shiny frame with the right nature. Correct?
I really appriciate all the help guys!