diff --git a/calc.js b/calc.js
index 6c4fcba..b14f076 100644
--- a/calc.js
+++ b/calc.js
@@ -49,7 +49,15 @@ function buildLexer() {
   const Pokemon = createToken({
     name: "Pokemon",
     pattern: new RegExp(
-      [...gen.species].map((s) => escapeRegExp(s.name)).join("|")
+      [...gen.species]
+        .flatMap((s) => [
+          // Important: formes are expanded first because the parser takes the
+          // first match, and the original species is always a subset of a
+          // forme.
+          ...(s.otherFormes || []).map(escapeRegExp),
+          escapeRegExp(s.name),
+        ])
+        .join("|")
     ),
   });
   const Move = createToken({
@@ -336,6 +344,12 @@ function test() {
 
   res = parseAndCalculate("Tera Electric Iron Hands Wild Charge vs Basculin");
   assert(res.attacker.teraType === "Electric", "should parse tera type");
+
+  res = parseAndCalculate("Gallade-Mega Triple Axel vs Gligar");
+  assert(res.attacker.name === "Gallade-Mega", "should parse Mega forme");
+
+  res = parseAndCalculate("Zoroark-Hisui Night Slash vs Golem");
+  assert(res.attacker.name === "Zoroark-Hisui", "should parse regional forme");
 }
 
 export { parseAndCalculate, test };