Increase enemy evasion

For some reason I ALWAYS have problems with parameters and stuff. Whenever I think I've figured it out, a month or so of hiatus pass and I've forgotten it all...

So I want a specific enemy to have high evasion, and I think a problem that might be interfering is the fact that all weapons in the game are not "weapons" but actually items (that's not something I can change since it's been like this for 4 years of production) and therefore have a success rate.

I've tried messing with HIT, EVA, TGR... nothing seems to work.

The only way to raise their evasion is to raise the EVA stat. That will affect anything that is a physical attack. If the attacks are magical attacks, then you have to raise the MEVA stat instead. But, if your items all use certain hit, then as far as I know it cannot be done, as certain hit means it always hits, no matter what.

Aaaaah I had everything as certain hit. Thank you!