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Okay, so I tried what OP suggested.
Nanomon vs.Castform, Rain Forme
The fight might extend on for a little bit, and could really go either way. If Castform could get a Water Gun that hits Nanomon in an opening of its metallic exterior, it could conceivably short-circuit Nanomon. But otherwise, anything it attacks with will probably be minimally effective. Nanomon lacks any electrical attacks to take advantage of Castform's typing, but makes up with it for powerful explosive projectile attack. In all likelihood, Nanomon wins.