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Use something bulky along with some sort of weather to counter the Hail. If you can counteract the Hail with basically anything but Sand, you'll be able to offset at least two of his Pokemon (usually Lapras/Charizard plus something else) While using something bulky, you can take a lot of hits, set up and sweep. Take a lot of healing items as well, because you can very easily fodder things off to wear down what he has, as long as something you have outspeeds all of his Pokemon. It doesn't have to necessarily defeat each one, but it needs to be faster and have more than two offensive attacks that will have neutral effect on everything he has.
Hope that helps. :]
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I did an unevolved run last week. I swept his whole team using x items and a lvl 60 Chinchou with Volt Absorb ability. It's the perfect counter for pikachu so you can set up.
