how can i improve my party?

I'm up too versing the elite 4, second time round when they get harder after beating the kanto gym leaders

I get up to Lance and don't even beat the first pokemon he sends out

My party:

Typhlosion - Lvl 69

Gengar - Lvl 72

Lugia - Lvl 68

Dragonite - Lvl 58

Golbat(shiny) - Lvl 56

Riolu (Exp sharing to lvl it up) - Lvl 37

What should i raise them too?, or any pokemon you sughgest i should catch?

also after i beat lance

will i need to train more to beat red?

or will i be able to beat him straight away?

thanks :)