In the old games, all you needed was one or two pokemon that had a type advantage over the Gym leader pokemon, and you were set.
But now, even though I have pokemon that are stronger in terms of type advantage, I need to train them up so they are close to equal to the pokemon the leader has. I went in the Delfwood City Gym with a level 12 Ralts and Taillow, and got beaten by Brawly.
A similar thing happened when I battled Roxanne. I thgought I'd wipe the floor with her using just Treeco. But I had to grab a water type before I was able to win (and if she would have used Rock Tomb more often, I probably woyld have lost).
But now, even though I have pokemon that are stronger in terms of type advantage, I need to train them up so they are close to equal to the pokemon the leader has. I went in the Delfwood City Gym with a level 12 Ralts and Taillow, and got beaten by Brawly.
A similar thing happened when I battled Roxanne. I thgought I'd wipe the floor with her using just Treeco. But I had to grab a water type before I was able to win (and if she would have used Rock Tomb more often, I probably woyld have lost).