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>first gym battle
fletchling = has an advantage over surskit and vivillon because it's a flying type
pikachu = electric is super effective against water and flying
>second gym battle
froakie = big advantage here because water is super effective against ground and rock
fletchling = knows steel wing, which is super effective against rock
pikachu = knows iron tail, which is super effective against rock
>third gym battle
fletchinder = has an advantage over machoke and mienfoo because it's a flying type. Fire is also super effective against lucario
hawlucha = advantage over machoke and mienfoo because it's a flying type. Fighting is super effective against Lucario
pikachu = ash's strongest pokemon, makes sense
ash has been using mostly pokemon with type advantage in the gyms this season