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Battle Variety
>single battles
>double battles
>triple battles
>rotation battles
>inverse battles
>sky battles
>underwater battles
>battles with preset terrains
>battles with preset weather
>battles with preset entry hazards
>battles where trainers can only use the same amount of pokemon (3v3, 6v6, etc.)
>battles where you have restrictions with the moves you can use, or the pokemon types you can use
It would make SUCH a difference. Imagine walking down a route and suddenly you're in a 3v3 battle, with Stealth Rocks preset. Or a trainer challenges you to a fight only using Grass-type pokemon. Or a Gym Leader has a permanent-Trick Room battlefield?
It'd be so awesome, and add such a depth of variety to the games.