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The Lum Berry in particular is useful since it can cure any status problem.
Berries come in handy, too, particularly since a Pokémon can use it, rather than forcing you to spend a turn using a Full Heal or other status-healing item. It was possible to have Pokémon relearn moves in Gen II as well, but it required a N64, Pokémon Stadium 2, a Transfer Pak to transfer your team over, beating the Elite 4 plus Champion using all six of your Pokémon at least once in battle.all for one single 'mon to be able to remember one move and finally transferring your team back to your GB cartridge if you so desired.
Given the usefulness of these items, some ambitious move restructuring would involve scooping these little creatures up by the teamful. Getting these requires the Player to hunt for either Luvdisc (for Heart Scales), digging them up in the Underground (Gen IV only) or battling Paras/Parasect (for Mushrooms), hoping the encountered 'mon has the desired item and catching them/ using moves to get enemies' items.
Starting with Pokémon Ruby and Sapphire one can easily re-teach Pokémon moves of their respective natural learnsets, but the NPC's services come at a price: depending on which game you play they want either Heart Scales or Mushrooms.
Shin Megami Tensei IMAGINE removes the need to farm monsters by letting players gather "remains of Tokyo" (basically, refuse) which can be sold to NPCs or recycled to craft weapons.This is surprisingly the fastest way to earn money:completing a level 70-ish dungeon rewards the player with the equivalent of 20-30.000 Macca, while the same amount can be gathered in about 15 minutes while standing in a level 14 zone. You need some bugs (and a Net to catch them with) for upgrading your potions. Link's equipment in Skyward Sword can be upgraded in the same way with materials.