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
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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.
Mystic Water increases the power of all Water-type attacks however in Pokémon FireRed, the increase in power is only a 10% increase.
The three starters in Pokemon Crystal are Cyndaquil (the fire type) , Totodile (water) and Chikorita (grass ).
go to cherrygrove. surf in the sea man gives it to you.