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>Tiered difficulty settings
>Each difficulty upwards adds new wild Pokemon or new Pokemon to enemy trainers, stronger than usual
>you could even see competitive sets or moves that they can learn through other methods
>wild encounter tables also have some Pokemon you normally wouldn't encounter (within reason, e.g. in a power plant like area you could find different steel, electric, and rock types the higher difficulty you go)
This was all I could think of. Kind of hard when there's barely any elements you could take from a game where you commit crime.