All right.. lets try a Supersonic . Follow it up with a Shockwave and end with a Bubblebeam -- hopefully it will be harder to dodge than just a stream of water. Make it wide-spread if he tries to make any evasive maneuvers. Feel free to Relax if he tries to Protect/Detect/Dig any of your moves. Substitute Bubblebeam for Swift if he tries to be cute and make clones.

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Supersonic ~ Shockwave ~ Bubblebeam/Swift
Sub: Relax