Sinnoh Leaders' weaknesses

These are the types of the pokemons the leaders of the SINNOH use:

  1. Rock :  A Sceptile of Lv-80 to 100 should do the work.

  2. Grass : A Magmorter or moltress of Lv- 80 to 100 should do the work. 

  3. Fight & Lucario: A Regigigas of Lv-100 should do the work.

  4. Water: A Sceptile and a Thunder type pokemon of Lv-80 to 100 should do the work.

  5. Ghost : A Fire and a Thunder type pokemon of Lv-80 to 100 should do the work.

  6. Steel: A Fire type pokemon of Lv-100 should do the work.

  7. Ice : A Fire type pokemon of Lv-100 should do the work.

  8. Electric : A Fire type pokemon and a regigigas of Lv-100 should do the work.

So, You may have a team like this,

Regigigas	Moltress	Any Thunder  Type	Darmanitan	Sceptile	Infernape
Focus Punch	Flamethrower	Thunder Wave	Flair Blitz	Solarbeam	Focus Punch
Earthqack	Overheat	Thunderbolt	Overheat	Leaf Storm	Flamethrower
Giga Impact	Giga impact	Thunder	Focus Punch	Focus Punch	Overheat
Hyper Beam	Hyper Beam	Focus Punch	Any You Like	Hyper Beam	Any You Like

TIPS

* Thunder Wave will paralize any pokemon. 

* Be careful with choosing and using your moves. Because when you will go further you will see that You have a lot of HP left of your pokemons but your pokemon's attack stats are all 0. So you will not be able to go further as you will not have any attacks left. So dont waste your attacks.

* Don't battle with any other trainer but the gym leaders.