I said by level 18 or so... I just remember that he capped out before he classed changed. You guys it is not that difficult get him and try it yourself. His growth rates as a Cavalier / Paladin are
HP Str Mag Skl Spd Lck Def Res
80% 15% 0% 55% 35% 45% 35% 5%
as you can see he is capable of getting all ups except magic. Thats 7 in one level up.
Just to let you know this is what he needs to cap out everything. This is the number of level ups needed in each area (promotion is figured in).
HP Str Mag Skl Spd Lck Def Res
34- 17- 26- 24- 18- 27- 15- 20
Now he has got 38 level ups. Use 15 for DEF that leaves 23 for MAG and you would need 2 spirit dusts to get you the rest of the way. As you know there are 5 spirit dusts in the game.
Now this is my Merris stats. more than capable of achieving (he got all my spirit dusts)
HP Str Mag Skl Spd Lck Def Res
55- 6- 25- 28- 25- 19- 20- 18
But wait he can and did for me get both DEF and MAG, at the same time.
As a Mage, Sage, Curate, Bishop
MAG 40%30%20%30% DEF 5%5%10%5%
Plain and simple it would be easy, but take alot of time to green him in everything. With the exception of STR that would be very hard to do.
Mine is only greened in SKL, SPD, and DEF.