Fix for GCC.

src/NaiveAI.hpp

@@ -13,7 +13,7 @@ namespace PkmnLibAI {
             auto c = battle->GetCreature(target).GetValue();
 
             auto highestScore = -1;
-            PkmnLib::Battling::LearnedMove* bestMove;
+            PkmnLib::Battling::LearnedMove* bestMove = nullptr;
             for (auto move : user->GetMoves()) {
                 if (!move.HasValue()) {
                     continue;