You can find it in the fourth puzzle of the Ruins of Alphs.
The fourth puzzle, Omanyte, can be accessed after you have HM03 - Surf and HM04 - Strength. Like the third puzzle, you must go through Union Cave. Instead of exiting through the northermost opening on the second floor, head west after Surfing and use Strength on the rock to get past and into the final cave.
To enter the secret room, U must have a waterstone in your bag.
Then you'll see 4 pokeballs. One of them contains "Mystic Water"
I hope it's a good answer.
go to cherrygrove. surf in the sea man gives it to you.
The Castform that you get from the guy at the Weather Institute has a Mystic Water attached to it. When held by a Pokemon,the Mystic Water raises the power of its Water-Type moves.
When held by a Pokemon its raises the power of water attacks.
The HM Dive is not in SoulSilver or HeartGold, for there is no deep water to dive into.
Have surf and go to Cherry Grove city and swim across the lake and talk to the guy. He will give you the mystic water item
go to cherrygrove. surf in the sea man gives it to you.
The Castform that you get from the guy at the Weather Institute has a Mystic Water attached to it. When held by a Pokemon,the Mystic Water raises the power of its Water-Type moves.
When held by a Pokemon its raises the power of water attacks.
there are none
water stone
you trade a Pokemon for a water Pokemon, catch a water Pokemon, or you migrate a water Pokemon from a gameboy game. you can also get a water Pokemon for your starter Pokemon. (i beat the game on both heartgold and soulsilver so if u need help please contact flyingstar369@gmail.com
The HM Dive is not in SoulSilver or HeartGold, for there is no deep water to dive into.
It powers up Water-type moves of the Pokemon holding it.
there is no mystic sleeping
Have surf and go to Cherry Grove city and swim across the lake and talk to the guy. He will give you the mystic water item
use rods or surf.
You use a water stone.