Elite Four + Diantha help?

[A Paragoomba and the Koopa Bros.]

So typically I'm a good Pokemon player, but I need help trying to beat the Elite Four and then Diantha.

Any good tips?

 

[Lily x]

Get yourself a good fairy type

 

[A Paragoomba and the Koopa Bros.]

The only fairy type I have is Xerneas.

 

[fantanoice]

That is a good fairy type.

I use Togekiss though.

 

[A Paragoomba and the Koopa Bros.]

I have Togekiss, but he's only level 31.

Lucario
Delphox
Absol
Xerneas
Vaporeon
Aurorus

I think I might need to replace some.

 

[fantanoice]

Can you, like, give one of them a Fairy move?

 

[A Paragoomba and the Koopa Bros.]

I'll try.

Lock please.