For about twenty minutes I was just riding around the red zone where it says Gordo should be, but I saw nothing. There were a ton of regular boars though, I've killed probably thirty of them and only had a few rounds for my sniper rifle left before they got the better of me. Lobo was punctual for our meeting, but when is this bastard supposed to show up? 

Try laying out some bait around other boars.  Gordo is a fatty and likes to eat up all the food and leave nothing for anyone else.

There's no inventory in multiplayer... or am I missing something?

for most those legendary animals in multiplayer, there is a burned out building that you can hide in and shoot the animals, and they are unable to enter, keep shooting the base animals until the legendary appears

there is no bait in multiplayer... do what i said in the post above

Alright, I think that was my problem, I kept going around the entire circle, so I guess i was leaving that Green Hollow place before I could kill the initial wave of boars. Thanks.

I really like the title you get for this challenge.

" I really like the title you get for this challenge. "