you use rock smash
NO
step on it
You can't but you can receive items by your friends
It classes it as a failed mission you lose money and some items.
You have to wear them.
You press b or x and go down to items
not yet.
you can't trade from MysteryDongeon1 to2.
They don't open dungeons, they open locked rooms within dungeons. Certain unique items can be found, like the Silk items, and treasure items for Legendary pokemon.
NO
I think its the water fire or lightning stone
you find them in dungeons