according to bulbapedia
Sobble has the ability to camouflage itself in water.
sounds like a greninja or kecleon's rip-off
That suggests Protean and Color Change as possible abilities. That would be lame though, so I hope they either think of a new ability, a new move, or make the guy Water-Ghost / Water-Psychic.
Things I would like to see:
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Ability: When attacked by a Water-type move, absorb the attack as HP, raise Sp.Atk by 1, then become untouchable for the next turn.
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Move: A Water-type Shadow Force, where the user disappears for the first turn, then strikes on the next turn. High physical damage. Hits through Protect.