Simple. Just add the following six Pokemon you would summon if YOU were the champion, and give them their levels, genders, and nicknames are optional. You can have the same species of Pokemon, but only up to 3. And you can even have only one legendary/shiny Pokemon. I also forgot to mention you can give them attacks as long as they can learn it.

1st Pokemon
Lucario
Lv. 77
Nickname: Anubis
Gender: M
Attack 1: Aura Sphere
Attack 2: Bone Rush
Attack 3: Iron Tail
Atatck 4: Strength

2nd Pokemon
Dragonite
Lv. 73
Nickname: Lancelot
Gender: M
Attack 1: Fire Blast
Attack 2: Hyper Beam
Attack 3: Fly
Attack 4: Swift

3rd Pokemon
Mightyena
Lv. 74
Nickname: Dark Fang
Gender: M
Attack 1: Shadow Ball
Attack 2: Crunch
Attack 3: Cut
Attack 4: Roar

4th Pokemon
Lucario (shiny)
Lv. 77
Nickname: Cleopatra
Gender: F
Attack 1: Aura Sphere
Attack 2: Seismic Toss
Attack 3: Hyper Kick
Attack 4: Rock Smash

5th Pokemon
Absol
Lv. 72
Nickname: Kiri
Gender: F
Attack 1: Hypnosis
Attack 2: Dream Eater
Attack 3: Sword Dance
Attack 4: Body Slam

6th Pokemon
Dewgong
Lv. 79
Nickname: Neptune
Gender: M
Attack 1: Surf
Attack 2: Waterfall
Attack 3: Dive
Attack 4: Blizzard

Prepare to steal, folks!