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Make all female characters significantly taller, bustier, and curvier, without altering outfits so that they're not lewd.
Extra difficulty levels:
>Hard Mode
what it sounds like, level/moveset/AI buff
>Dante Must Die mode
all trainers have 4-6 pokemon, but you can now buy ethers.
>Revengeancemode
Every major battler in the game uses 8 pokemon, Smogon-champion-tier AI, many music tracks are replaced with hardore electric butt rock versions (except the calmer stuff like route music which just gets a little remix). You can now buy Max Elixers (and down) and Max Revives.
>Double-Rotation battles
You divide your team into two sets of three, which can rotate, but the only active pokemon at the time play as if it were doubles. This way you can have full 6-on-6 without being a clusterfuck
>Tamer Zone
Like the Safari Zone, but a minigame where you fight the wild pokemon yourself (if you remember, the trainer was originally meant to battle ALONGSIDE their pokemon in RBGY, but that content didn't make it into the final game, this is that, but taken up a notch.) This is the place where you obtain pokemon with hidden abilities. You can populate the zone which generates semi-randomly each day with up to five sets of 3 pokemon based on your friends list (like the Friend Zone) at once.
>Limit Break Training
A pokemon that has bad IVs may be trained in a Mystery Dungeon-type minigame where they fight in real time against other wild 'mons in a controlled holographic environment. The special training can raise IVs, but it only affects that pokemon. Offspring will inherit IVs as if the 'mon never trained at all
>Ambushes
Like horde battles, but sometimes trainers that you've wronged or been rude to (we karma system now) or not tipped or something can gang up and hunt you down if you're not careful. Gym Leaders might do this just to make sure you're training well and might give you some special items or TMs if you beat them