The light type. I'm sure it has been suggested before...
Shouldn't be hard to do, right?
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Power gems (Item): These work like TMs except they are one time use items that are used in battle and don't take a move slot.
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Yes or No option for battles: Tired of "Hey I've seen you, and now I'm going to pwn you in an unfair battle, because you have one pokemon with three HP left." Just say "I'm sorry I must decline your request."
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Thunder storm (Move): Changes the weather to a thunder storm. (Draw Back: Would need a castform... which leds me to)
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Castform (Sand form): You know. Castform+Sandstorm (It is a weather effect...)
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More to come!