How do you beat the sensei in clubpenguin?

first u nead the black belt and then battle sensei after 5-6 times u will winn him

It took me over 15- 20 times to beat him, he gets weaker every time.

it only took me 3 times o burn

i don't like card jitsu cos theres no point in it

i beat the sensei inone try burn!!!!!!!!!!!!!!