It does not evolve.
Delibird's base experience yield is 116.
Defeating a wild Delibird yields 1 Speed EV.
It is only available during Christmas Events along with Stantler.
If caught or defeated, it will drop a christmas present, along with a chance at another drop.
|Ability 1||Ability 2||Hidden|
|Rate (Gold Membership)||Drop|
|Anywhere during the Christmas Event (besides fishing/surfing)||Rare||Depending on your highest Pokemon level||1/100 (1%)||Present|