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Ken, that's SECRET Power. And it sounds good except for the 30-70 part. That's it's base power, not accuracy. Here's what Bulbapedia says:


Hidden Power

Battles
Type  Normal
Category  Special
PP  15 (max. 24)
Power  Varies between 30 to 70
Accuracy  100%
Does not make contact

Secret power is easy
That just changes depending on where you're battleing.

Hidden power would be a little harder.
It can be any type except for normal, but it's the same every time the same pokemon uses it.
For instance:
Pikachu 1 uses Hidden Power and it ends up being an electric type move. That's all fine but it won't get the STAB for it, and Thunderbolt is generally better.
Pikachu 2 uses it and it's a water type move. That would be a good move for the Pikachu as it will cover some of its weaknesses.

I say that when a pokemon learns Hidden Power they have to create a random number 1-16 and that number is what type of attack it is. They then add the type at the end of the attack so that the trainer knows what type of attack it is, but until it attacks the opponent anyone else has no idea on what it is.
If that's fine with everyone else.
...
I already said that Braitto's gym's Galvantula has a water based Hidden Power... Hasn't been used though...

Nature power and Secret power are close enough to the same thing.
I think we could put up something for each route if it comes down to it, but it should be obvious which move/effect should happen based on where the trainer is.

If you do roll for it keep a note on what type each pokemon has.
I would put it in the Profile in 1sized font if you're not using it as a move.