Billionaire investor William Ackman, whose fund is the largest shareholder in Allergan Inc., and Valeant Pharmaceuticals said the botox maker’s Chief Executive Officer David Pyott tried to discredit Valeant as it was making a hostile takeover bid, court documents showed. Ackman’s hedge fund has been working with Valeant for months to craft a deal for Valeant to buy Allergan, but Allergan has rejected all of Valeant’s overtures and tried to find other potential partners to avoid a deal.