In an interview , Pokémon Diamond and Pearl director Junichi Masuda noted Lucario 's name as one of the most difficult to create , due to an effort to make it appealing to both Japanese and American audiences .
In an interview with Pokémon Diamond and Pearl director Junichi Masuda , he noted Lucario 's name as one of the hardest to make , because they wanted to make it work for both the Japanese and Americans .