don't think it'd work very well. psyshock users and just regular switchins would pick it's defense apart. you're better playing to gyarados' strengths. jellicent and slowbro exceed at this role far better. and a specially defensive wall with a 4X electric weakness is hell in a tier where Bolt/beam is common. It's a new idea and may have unpredictability value but otherwise it's trouble. I mean, mantine has the same rough sp.def, typing and role and it's NU.
On the plus side it walls common fighting types, and intimidate is useful, but a simple switch (especially with a status absorber or gastodon) would leave you cold.
honestly, I think you're better off with another mon or technique here. the unpredictability is great, though. if you like the technique and can use it then it could work. hell, at least it would be a laugh and something different. but I don't think it'd be worth it.