Describe the feature you would like
There are a few items missing from certain Poke Marts that could improve the early game experience:
Viridian Mart: Add Potion _(& change _ViridianMartText3 to reflect this change)_
Potions are available in Pewter City, so their being unavailable in Viridian only prevents the player from having spare Potions on hand for the one unavoidable Bug Catcher fight in Viridian Forest. Adding Potions to Viridian just eliminates a lot of tedious and unnecessary back-and-forth.
Pewter (& possibly also Viridian) Mart: Add Repel
I don't think the play experience is much improved by mandatory bat and bug swarms in Mt. Moon/Viridian Forest. There's an argument to be made that it forces the player to train since you can't run if your mon is too slow, but eh. I just don't enjoy dealing with the Zubat horde.
At some point, maybe as late as the postgame shop: Add Max Revive
Up to you if you think making these available before the E4 will dilute the difficulty on shift/easy mode, but if you're playing on set/hard mode you can't use them in battle anyway so it's just a post-battle convenience.
Describe the feature you would like There are a few items missing from certain Poke Marts that could improve the early game experience:
Viridian Mart: Add Potion _(& change
_ViridianMartText3
to reflect this change)_Pewter (& possibly also Viridian) Mart: Add Repel
At some point, maybe as late as the postgame shop: Add Max Revive