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Easy mode
>EXP All is always on
>PC can be accessed from anywhere
>Every gym leader has fewer Pokemon than they would in Normal Mode
>Trainer Pokemon have a maximum of 2 moves, gym leaders 3, and E4 + rivals have full movesets
>"Boss trainers" don't have Pokemon with items and don't use healing items
>Super effective attacks are labelled as such
>Trainers will never switch Pokemon
Normal mode
>EXP Share works like normal, EXP All can be gotten as an upgrade
>PC can only be accessed from Pokemon Centers
>Gym leaders, rival battles, and E4 have better AI, and their Pokemon all have 10 IVs in every stat as well as maxed out EVs evenly distributed between all their stats.
>Champion is the same, but with 20 IVs in every stat
>"Boss trainers" will have an Oran/Sitrus/Pinch berry on their "ace" and will use a set amount of healing potions when their Pokemon are low on health
>Trainers will switch out if their Pokemon is in an extremely disadvantageous position
>No Super effective attack assist
Challenge mode
>EXP Share locked to the post game
>PC can only be accessed from Pokemon Centers and can never heal Pokemon (until post game)
>Using the Pokemon center costs money (100 pokedollars at the start, +100 for every gym leader beaten)
>Consumable items (revives, potions, etc) cost 2x their normal value until the post game
>Trainers provide 1.5x pokedollars when defeated
>Gym leaders will have more Pokemon than on Normal Mode
>"Boss trainers" will have items on all of their Pokemon, their Pokemon will all have 21 IVs in all stats, and they will have competitively allocated EV sets and competitively viable movesets
>"Boss trainers" will also have competitive gimmicks, using things like weather, Trick Room, Perish trapping, and so on
>Trainers will switch if they ever see a good opportunity to do so
>You get a mark on your Trainer Card if you beat the game in Challenge Mode as well as 20x vitamins, IV mints, and BP
You can always adjust the difficulty downwards, but never up
