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Yes, Dewgong is awesome, because it can learn Ice and Water-Type moves, so you'd have no problem against Fire and Grass-Type Pokemon. Don't teach it Sheer Cold though. Signal Beam is a unique move for Dewgong.
You cannot obtain Ice beam as a TM in Crystal. You can only learn it from the Move Tutor in Blackthorn City. You can also catch: Seel, Dewgong, Shelder, Lapras, Articuno, Remoraid, and Octillary, and level them up to learn it.
The best ice Pokemon in firered and leafgreen is sneasel coz it have an very high attack stat and speed it can learn dark and ice attack such as ice beam blizard for ice beat up shadow ball and more..............
Ariados does not naturally learn the move Signal Beam in Pokemon Emerald. If bred with Venonat, Venomoth, or Volbeat however it will learn Signal Beam.
Lapras will learn Ice Beam at level 31.