set up a custom game of arena and choose a map ( I personally used Weather control) but it's been suggested to me Aviary is the easiest map
There isn't really anything useful on the map effect section for arena but I activated Fair weather anyway
then in extras I used these settings
difficulty: favors monster
wildlife population: high
strikes: 0
character perks: on (activate the faster feeding perk)
mastery bonus: on
elite wildlife: on
battle wins required: 1 (easiest done on first wave, if you fail its easier to just start a new game)
monster starting armor: 100%
monster starting stage: 2
sudden death: off
I used a Wraith with decoy and supernova. When the game started I killed 3 of the hunters and left 1 alive so the round would continue. i then looped round the map harvesting wildlife and popping the odd decoy so my feeding was not interrupted. I got this on my second attempt as the time ran out on my first go without enough wildlife to get me the evolution.
May take a few tries