Platinum Elite Four

To start this blog off, I am battling the elite four in platinum, I just failed my 3rd try with them and am trying to work out how to beat just 2 Pokemon that I am having trouble with.

These 2 would be Champion Cynthia's Garchomp and Togekiss.

Champion Cynthia's Garchomp has these moves

• Flamethrower
• Earthquake
• Dragon Rush
• ?

and

Champion Cynthia's Togekiss, clearly i need to look into this one, didn't write down what it had.

• Psychic
• Air Slash
• ?
• ?