Rusted Kushala Daora

The Rusted Kushala Daora is an older Kushala Daora that hasn't shed its metallic scales recently. In response, its shiny, silver, metallic skin becomes a rusted brown. It can be fought in a download quest in Monster Hunter Freedom 2, and in the Gathering Hall (Quest Level 5, only able to start Quest if you've completed all HR2 and 3 Quests). Both of these Quests happen in the Town. In Monster Hunter Freedom 2, it fights the same as a Kushala Daora and has the same carves. It should be noted that when you fight it, there is no storm, so all barrel bombs can be used.

Easy way to kill/repel is to poison it and try to break its head in the process which when broken the wind barrier disappears, If you repel it the first time using the poison weapon and break its head the next time fight him with a weapon with dragon attribute to kill it quickly/easier.