Aggron Mega Evolves into Mega Aggron. When it does, the destructive ability of its fearsome horns can turn a steel-clad tank into so much scrap metal. Aggronite, the Mega Stone needed to Mega Evolve Aggron, can only be obtained in Pokémon Y. By Mega Evolving, Aggron changes both its type and its Ability. By changing to a purely STEEL-type Pokémon, it reduces its weaknesses, and its Filter Ability also reduces the damage it takes from supereffective moves.
Beautiful. This ancient blade type inspires innovation in modern blade smithing. Originally made of bronze this blade did its very best to overcome the challenges of the relatively weak metal. With modern HC steel, electrum-bronze plated blade-except for the cutting edge- and some semblance of a handguard wrapped in paracord this could have been the perfect survival sword. Its downfall. Too recognizable.