Any plans or chance on making a board for this? Extension or otherwise?

Would that not be the same as Any% No Save Corruption (a main category)?

I think he is saying use glitches to beat the game with glitch pokemon and walk thru walls or something. Don't use menu stack.

Any% No Save Corruption does not use inventory underflow, if that's what you mean.

It's basically no credits warping.

Here is my run of it:

krazyd4n has a couple runs up too - here is the fastest (i think)

@40wattrange you can now submit your run here https://www.speedrun.com/pkmnrbext#Any_No_Item_Underflow