Quoted By:
>Palkia Lv. 67
>Lopunny Lv. 70
>Staraptor Lv. 73
>Gardevoir Lv. 69
>Luxray Lv. 70
>Torterra Lv. 76
First of all: Bless Grand Underground.
Staraptor and Luxray were beasts through the entire game, almost perfect IVs.
Also, through between some of the fights: I used a TM's to switch the moves of some Pokémon, such as Staraptor's Aerial Ace for Steel Wing.
Wasn't really that hard, considering that I was overleveled.