Rebuilt Gorilla Bot
Source: Drop. The convenient part of robots that fight each other is that you can just put them back together. Step two is to attach a giant laser cannon to ensu... Mechanical type. / is a pet made from gathering several items. The materials for can only be found as Alliance.
The 
Rebuilt Gorilla Bot is an Alliance-only craftable battle pet from Battle for Azeroth, assembled from three materials that drop exclusively during Faction Assaults in Vol'dun.
Guide awaiting review
Wait for Vol'dun Assault
The materials for Rebuilt Gorilla Bot can only be obtained when a Faction Assault (incursion) is active in Vol'dun. You must be playing as Alliance to collect these materials; the Horde equivalent pet is the 
Rebuilt Mechanical Spider.
Watch Dookthar and Arachni Fight
During the assault, Dookthar the Destroyer and Arachni will battle each other on the bridge. When one wins, it drops a lootable cache — you need the gorilla bot (Dookthar's side) to win as Alliance to loot your material. One player reported being unable to loot the cache when the spider won, suggesting Alliance players require the gorilla bot to be victorious.
Loot the Cache Once
The cache contains one of three required materials: 
Banana-Shaped Power Cell, 
Steel-Plated Primate Exoskeleton, or 
Bludgeoning-Resistant Chest Reinforcer. You can only loot the cache once per invasion, and since all three items are unique, expect a minimum of three separate invasions to collect them all.
Assemble or Buy the Pet
Once all three materials are gathered, combine them to create the Rebuilt Gorilla Bot. The pet can be caged, so it is also available for purchase from other players on the Auction House if you prefer not to farm the materials yourself.
Tips
The battle between Dookthar the Destroyer and Arachni can occur even when the associated world quest is not currently active during an assault, so check the bridge regardless of whether the world quest is listed.
