So I am playing Pokemon Pearl. I understand the concept of the game but I honestly have never been good at them. I had an okay team in previous games but I suck at Pearl. I'm at the third gym up against fighting type pokemon. I can get past the first two pokemon but her Lucario kicks my ass every time with drain punch.

My Team: Lv.33 Prinplup
Lv.21 Ponyta
Lv.19 Sudowoodo
Lv.18 Psyduck
Lv. 12 Bidoof (HM Whore)
And an egg.

How do I get past this bitch /vp/?