This page gives detailed information about the Skull 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)
Skull
Name (Japan)
スカルジャー
Name (Easytype)
どくろせんし
Boss
No
HP
740
Level
31
EXP
1580 (USA and Easytype) / 1577 (Japan)
GP
120 (USA and Easytype) / 116 (Japan)
Race
Undead
Agility
21 - 24
Physical Attack
6 x 74 [70%]
Physical Defense
2 x 3 [25%] (USA and Easytype) / 3 x 3 [25%] (Japan)