How do you open those gates?

What gates are you talking about. If you would actually tell me the level, I could most likely help you out. Don't forget to give us the full details of your problem, so we can give our best answer.

To open a gate you have to get a Pokemon to step/fall on a red switch. In the Poliwag/Slowpoke level you will see a switch near the end neat the gate. Through a Pester ball OVER it. A Porygon will pop out and land on the switch. In the Mankey level you have to hit a Squirtle near the mountain after the whirlpool where you find Dragonite with PKMN food or Pester ball to hit the Mankey up top. He should fall over the mountain. Then when you see him again he should be close to a switch hit him with a pester ball and he will roll onto the switch. Hope I helped better than he did.

Hmmm...The first you need to hit the Electrode with the apple near the end of the tunnel course to make it blow up. The next few have to have their respective red buttons stepped on by agitated Pokemon, like green37889 said... And that's all, there is no more. -jbjbh signing out, Happy Hacking;)

what gates are you talking about be more specific or how am i suppose to know what your talking about. imagine yourself in my position you would be confused too... think about it