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>Rivals
I feel like the concept of the classic rival character that nips at your heels the whole game is tired and done. How about instead, you make friends and spark rivalries by talking to people you meet throughout the region? It's completely optional, but rewarding by providing additional challenging battles, or being given a unique or rare item.
>Move tutoring
You get a handy device that allows you to teach a Pokemon any move that it's capable of learning. The catch is you have to see that move used in battle at least once, or you have to own a Pokemon knowing that move. Eliminating unnecessary barriers to teaching your Pokemon moves means easier and faster teambuilding.