Well, we took the Pokémon was taken up by the Psychic- against Ghost-type will be battled. I think the Ghost-type Pokémon was infavor of Gengar against the Psychic-type Pokémon was infavor of Alakazam. There are the rivals of the each type depends on Ghost/Psychic showdown collide and I guess what they took the moves such as Ghost-type is TM30 (Shadow Ball) vs. Psychic-type is TM29 (Psychic). Therefore, the Ghost-type was super-effective damage against to Psychic-type and that was the nice shot of your Pokémon...