It does not evolve.
Articuno's base experience yield is 261.
Defeating a wild Articuno yields 3 Special Defense EVs.
Articuno is found with your lead Pokemon holding the Feather of Articuno. It is a very small encounter rate, and can only be found in Seafoam Island
|Ability 1||Ability 2||Hidden|
|Location(s)||Spawn Level||Rarity||Spawn rate (Without Enhanced Feather)||Spawn Rate (With Enhanced Feather)|
|Seafoam Cave||85||Legendary||0.000005% (1/200,000)||0.00000625% (1/160,000)|