Update rulesets.js

Edited the PBV calculation to round to the nearest multiple of 5.
pbvWithEviolite = Math.round(pokemonTemplate.pokebattlevalue * evioliteMultiplier) //rounds, but not to the nearest 5
pbvWithEviolite = (Math.round(pokemonTemplate.pokebattlevalue * evioliteMultiplier / 5) * 5) //rounds to the nearest 5
Merge pull request #5 from Kouhai-Senpai/patch-5

Update rulesets.js