Ruby is a material that can be obtained by smelting ruby ore or as a drop from certain Pokémon. It can be used to make ruby tools and Magma armor. It can also be made into ruby blocks for storage or decoration. Move tutors sometimes require rubies as payment for their services. Right-clicking one of the Lake Trio members with a ruby when the requirements are fulfilled will give you either a Ruby of Emotion, Knowledge, or Willpower.