first if ur starter was a water type then u hav an advantage
make sure your partner knows water gun bubble or razor leaf/absorb if grass type
umm....tell me who your hero is if it is riolu just throw seeds and use force palm.....it should take you 2 times (the most) to beat him
no
then you fight groudon
no
Beat the elite four
Get type coverage moves
you need to keep using water attacks to kill it because it is a fire and ground
You would have to get a groudon from someone else if you wanted one before you beat the game.
You don't fight Groudon in Foggy Forest... Sorry but Groudon was fake remember? You have to go through the steamy cave or something and then you will fight UXIE not Groudon (by thePokeMan:) also, groudon is one of the seven wondermail Pokemon that you must get in special dungeons, here's the one for the shimmering desert which groundon is in : #&S6 NY2& YJN= 1P57 FOMN MH7Y
You can always catch Groudon. And Rayquaza too.
You don't awaken him until you beat the elite 4. Then go to the weather institute and they will tell you where to go for each Pokemon KYOGRE/GROUDON.