How do I increase my evasion in the NES version?

[Nagumo]

- How many hits does it take for your evasion level to go up (still haven't figured it out)
Evasion drives me crazy, it's all so vague.

I really don't think there's a set number of hits. I think it's random. Sometimes a hit makes your HP or evasion increase, and sometimes it doesn't. And when it does, sometimes it's by a little, and sometimes it's by a lot. This is the way I've noticed it, but I could be wrong.

From what I understand you only have to be targeted by an enemy if you want it to raise. Usually my characters have to be targeted around 120 times or so. ( I always have 1 character in the front row and the others in the back row when I grind for evasion) Maybe it has something to do with the rank that the monsters have?