I think any electric type Pokemon would be okay.
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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.
Dewgong evolves from seel
you can only find Seel i believe... then you can evolve it to a dewgong, I highly doubt you can find a wild dewgong =/
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it doesnt evolve seel evolves into dewgong