User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-217.129.17.186-20130328155438/@comment-4009941-20130403201220

Its been done if you read quest descriptions people be asking you to capture them pets and stuff including Royal Ludroth,Rathalos and Rathian and the Instructer has a pet Rajang.

Along with that I have a pet Azure Rathalos,Black Diablos and Gravios on Frontier.

So yeah alot are able to be trained and domesticated. Though I dont think id trust a pet Shogun or Garuga.