Pikachu may not be Ash's best Pokémon, but neither is Gastly the only phantom Pokémon worth training, although what the PokéTips channel on YouTube It is a good indicator that this spooky ball of poisonous gas It is a rival to consider in the hands of a well-trained Pokémon Trainer.
In fact, in the video below you will see how it is more than enough to have a Gastly level 1 equipped with a Focus Band to resist Leon's most powerful attacks and connect Gastly's movements with his rivals. If you look, once the first Pokémon, Aegislash, the Gastly is defeated go up to level 21, making the task even easier.
What do you think about this Pokémon tactic control and knowledge lesson? We have found it very interesting, it is obvious that if you are a good player and think about the weaknesses of the rival, you can defeat him even in the most unexpected ways