Currently, Kidd only has two Weavile. I'll switch to sprites if she obtains anything else.
Both are male, and both share three attacks, which are Blizzard, Shadow Ball, and Ice Beam. One has Night Slash and the other has Thief (note that all but Night Slash are TM moves). They're used for business purposes - Kidd partakes in tournaments and battles to take up her time if she's waiting for a lead on her current mission.
Both Weavile quite enjoy dancing. They'd totally do Contests if Kidd didn't think the activity almost entirely meaningless.