it depends on what Pokemon/type you are. its always the same type if you use it with the same Pokemon over and over again.
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Depending on the pokemon, it will randomly pick a type and strength of the move. It is a very unique attack.
If your Pokemon can't learn grass, it's your only hope, but Unown only has one move which is Psychic Hidden Power, so I think Psychic's hidden power is better than Grass.
It depends on the Pokemon your using.
unown's hidden power is simple: it works the same as any other hidden power. so if your in a cave i think the move's type is dark, on or under water is water, forest and grassland is grass, on rocky ground of course is ground or rock. I've played since 2003 and I am still not sure.
No, since Hidden Power depends on a Pokemon's stats to determine the type/damage. Thus all four hidden powers would be the same.