On route 42 there is a trainer named "Fisherman Tully", he is standing at the waters edge on your left when you exit Mt. Mortar. If you talk to him after battling him and register his number, then come back 4 or 5 times to talk to him or battle, or if he calls you or vice versa, then about the 6th time he will call and say he has found something for you, and it will be a water stone! Hope this helps!
Only Gloom and Sunkern
Go to northern field where suicune is at.
No Pokemon evolve with a wish stone. The wish stone is an item exclusive to Pokemon Mystery Dungeon: Blue Rescue Team/ Red Rescue Team. It is used to make a wish when Jirachi is encountered.
Yes you can you can find stones in dungeons or get them from rescue missions.
If you are talking about Pokemon mystery dungeon red rescue team or Pokemon mystery dungeon blue rescue team then: Talk to alakazam, he'll mention something about the 3 great birds. once you go to them they will give you a stone which allows you into a new dungeon which has lugia.
29F in Northwind Field a key is required
No The Dusk Stone was first introduced in Generation 4. It did not exist in the Generation you are speaking of.
go to level 50
u go to evolve place and give leaf stone
Use a Key on 27F in Northwind Fields and get the Water Stone.
Fire Stones are found at the last level (29F) of Fiery Fields.
The 50th floor. you can also get it from medicam