initial commit

src/battle/rulesets/gen1_faithful.lua

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+-- Default ruleset: preserve Gen 1 behavior, including the famous quirks.
+
+return {
+  name = "gen1_faithful",
+  -- accuracy roll is rand(0..255) < floor(acc*255/100): a 100%-accurate
+  -- move still misses on a roll of 255 (the 1/256 miss)
+  oneIn256Miss = true,
+  -- critical hits use base speed (not current speed) and ignore stat stages
+  critUsesBaseSpeed = true,
+  critIgnoresStages = true,
+  -- damage random factor r in [217,255], damage = damage * r / 255
+  randMin = 217,
+  randMax = 255,
+  -- Focus Energy famously QUARTERS the crit rate instead of x4
+  focusEnergyBug = true,
+}

src/battle/rulesets/modern_clean.lua

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+-- Optional ruleset that removes the most notorious Gen 1 quirks while
+-- keeping the same formulas.  Not the default.
+
+return {
+  name = "modern_clean",
+  oneIn256Miss = false,
+  critUsesBaseSpeed = true,
+  critIgnoresStages = false,
+  randMin = 217,
+  randMax = 255,
+  focusEnergyBug = false,
+}