From Emil Chronicle Wiki

Jumbo ChockKo is a level 10 monster.

[edit] Stats

Basic	Combat
Level 10 Experience 8,000 Job Experience 2,000 HP 9,800 SP 0 MP 0 Behavior Aggressive	Type Bird Boss Skill A.SPD 2.98 ATK 47 - 77 DEF 12 - 36 C.SPD 3.00 M.ATK 48 - 119 M.DEF 27 - 84
Properties Fire(20%) Item Drops Wing Mask, Cockatrice Eye, Catty Booster, Giant Cockko Stamp Skills  ??? Location Acronia Eastern Beach (it only appears during 11.00 A.M. or 11.00 P.M.)