This page gives detailed information about the Plague monster. Do note that while many monsters have a non-zero physical and magic evade defined, a bug (or last minute design choice that looks like a bug) prevents them from being loaded properly at the start of the battle. Therefore, except for monsters that change their parameters during the battle (such as Valvalis), you can assume the evade value is 0%.
Basic Information
Name (USA)
Plague
Name (Japan)
プレイグ
Name (Easytype)
プレイグ
Boss
Yes
HP
28000 (USA and Easytype) / 33333 (Japan)
Level
96
EXP
31200 (USA and Easytype) / 31108 (Japan)
GP
550
Race
None
Agility
29 - 32
Physical Attack
11 x 146 [90%]
Physical Defense
4 x 5 [50%]
Magic Defense
7 x 32 [50%] (USA and Easytype) / 8 x 38 [50%] (Japan)