Hum... No. First of all, I dunno if this will be your first RNG abuse but as you seem to have no basic knowledge about it I'd bet it is. And if I'm correct, you should
not, in any case, start by a wondercard abuse. You can use the RNG mechanics to get wondercard Pokémon with perfect IV's. However, the natures are totally random and therefore, can not be controlled. For someone with no experience, it would be really hard to hit a particular delay and frame enough times to get the desired nature, especially when taking into account the fact that there are annoying NPC's inside the Pokémart.
The thing is, before the frame advancement you mention, you'd have to hit the desired seed by hitting the correct delay and seconds when you enter the gameworld.
That said, you can't just start RNG'ing without learning the basics. It's not that simple. You need to do a calibration phase to find out your usual delay and seconds value and you should get familiarized with the process of RNG breeding and capturing before attempting to do it on wondercard Pokémon.
I'm not going to explain how because there are better guides, made with time and better than anything I could possibly write right now.
However, I can redirect you to these guides:
This is a nice guide on pretty much everything (though I don't know if it also includes the
much needed calibration phase) and the videos located on
this post are quite helpful as well (they played an important role on how I learned to RNG 2 years ago).