999 rounded to 995?

[Dmode2]

From generation 3 onwards, whether you use an Action Replay or PKHeX or what have you to hack for 999 of an item, the pokemon games always round down to 995 when you launch your game. However, at least in gen 3 when I have tried purchasing 999 of an item, saving, and then relaunching, the item count stays at 999. Why does this happen, and is there any way to get PKHeX to keep the count at 999?

[Guest]

It's not the game that does this, but the codes and editors.
The reason is: If you have 999 of an item, you can no longer receive the ones you usually get and there's a chance you get stuck in the game.