there are four battles with mars
1: valley windworks
2: lake verity
3: tag battle with Jupiter at spear pillar
4: stark mountain
on Pokemon platinum mars and Jupiter plus charon is in stark mountain ok
on mars
In the lake valor cavern
Yes there is and you will know about what day to catch Drifloon after beating a Team Galactic Commander named Mars for the first time after a bit of time of battling
you need to beat commander mars first. after a battle the scientist wll tell you there is a balloon Pokemon that always come. drifloon always came every Friday. hope it help!
with empoleon ,infernape and torterra
It depends; if you mean the first time, you go back to Floaroma Town and talk to the man with the honey. He'll give you x10 honey and then you can move on and go to Eterna.
There are two earthquakes in Pokemon Platinum. The first one is in Pastoria City, but you then don't have to fight him. The second one is at Lake Valor (you're in Canalave City then). Commander Saturn is in the cave at Lake Valor
They basically disappear for the rest of the game
You see her in the eterna city team galactic building
Go to mt Coronet, beat Mars and Jupiter and you will see a portl
beat mars in valley windworks