Could even use Lanturn + Gastrodon in case of species clause - Lanturn has water absorb and Gastrodon is naturally immune to discharge and obviously has storm drain for surf. Only downside is you can't use EQ, but I'd rather use Earth Power anyways.
Edit: although I should mention, neither strategy is particularly strong, they're too weak to begin with and to actually get strong enough to do damage takes so long you'd have been better off using a normal team, unfortunately.