Your pokemon can level up by around 5 levels per week if you train them hard enough without you completely tiring them out. In about a month, with type advantages on your side, you'd be strong enough to challenge Brock. He's the one you're supposed to go for first.
It's not just levels or types, either. You have to have a good strategy against your opponent, or you might lose even if you have the advantage otherwise.
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Your pokemon can level up by around 5 levels per week if you train them hard enough without you completely tiring them out. In about a month, with type advantages on your side, you'd be strong enough to challenge Brock. He's the one you're supposed to go for first.
It's not just levels or types, either. You have to have a good strategy against your opponent, or you might lose even if you have the advantage otherwise.