Damage - It's pretty high to start, but his strength gains are nothing to boast about.
Critical - If it wasn't for the fact that Berserkers get a 30% critical increase, this would be very low.
Speed - Yay! He hits twice on the Chapter you get him! Then it goes way down.
Dodge - He's big and fat, and the reason he has that gigantic scar on his face is because his dodge is so bad that he couldn't move out of the way of a thumb tack.
Growth Rates
HP - 70%
Strength - 45%
Skill - 25%
Speed - 25%
Defense - 15%
Resistence - 5%
Luck - 15%
Average Level 20 Berserker Garret(Hard mode stats in parenthesis)
HP - 60(60)
Strength - 26(29)
Skill - 18(21)
Speed - 15(18)
Defense - 12(13)
Resistence - 5(6)
Luck - 15(17)
Total - 151(164)
Supports
Lilina - 25/30/40 turns
Geese - 59/60/80 turns
Lalum - 59/60/80 turns
Cath - 59/60/80 turns
Gonzales - 40/60/80 turns
Rating - 6/10. When almost every single Paladin in the game is very good, all the Heroes not counting Echidna are very good, AND all the Primary-Axe units all turn out good including the two characters that promote to Berserkers, why would you want to raise the worst one? His only purpose is to get an "S" in axes if for some crazy reason you decide to not use any axes in the game until this point. Or to give experience to a recently promoted unit.