Unevolved vs Evolved

[Crit Freak]

so i have a cute jelly as my pet (vani) and i don't want him to evolve cuz he'll look ugly =(

just how much more powerful do they grow when they evolve? and does evolution effect how they grow? (doubt it since it should be all random)

[crash]

I've heard of people getting as much as 15 INT for free.

[Tyrant]

There is a chance to get up to +10 per stats. It is random so you can get +1 to all or +10 to all. I've done about 4-5 and got a lot of +10's every time but other people have gotten bad evolutions, all luck. When stats start getting 120/130+, the bonuses are really good and are worth it. It could mean 60-70 more atk, 2 more int bonus(~100), 3 aspd, etc. HP and SP don't really get much its usually like 20 hp and a few sp. Also if you missed a bonus by a couple points, you'll most likely get to the next bonus.