Whiscash Pond is not in Pokemon Mystery Dungeon: Explorers of Time/Darkness. It is in Explorers: Red/Blue Rescue Team though.
in spere pillar
Mystery road doesn't exist.
up your butt
find it in a dungeon
You cannot find a deoxys normally(during game play). but you can get it during an event. first you have to get a mystery gift. if you do not have the mystery gift, it is explained on the Pokemon website. there is no deoxys event currently going on.
Wishcash after you beat raquaza and a bit further in the story
in spere pillar
You must beat Rayquaza then you will find out that Snubull evolves into Granbull so at Wishcash Pond you come alone and you go into the cave and you can evolve!
Mystery road doesn't exist.
it lets you find extra legendary Pokemon in dungons
in lilycove
you get mystery gift it automatically after you get the pokedex in the game. try going to serebii.net to find out what pokemon event is going on through mystery gift.
you can find giratina in caper mine
You randomaly find them in later dungeouns.
Any Pokemon mart.
i do not know i will try find out
MYSTERY GIFT!