Olivine Gym: 
Okay! Let's start with the trainers you can battle in the Olivine Gym.
Wait... there is none. They just cheer on for you.

Jasmine's whole team is weak to Ground, Fire, and Fighting Type moves.
"Thank you for your help at the Lighthouse... But this is different. Please allow me to
introduce myself. I'm Jasmine, a Gym Leader. I use the Steel-type. ...Do you know about
the Steel-type It's a type that was only recently discovered. ...Um... May I begin"

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 Jasmine: 

 Magnemite: 

 Level: 
 30
 Type: 
 Electric|Steel
 Ability: 
Magnet Pull ~ Prevents Steel Type Pokemon from escaping.
 Moves: 
Thunder Wave
Supersonic
Thunderbolt
Sonic Boom
 Review: 
 Magnemite could be annoying if it uses Thunder Wave to paralyze you and|or use Supersonic
to confuse your Pokemon. Other than that watch out for Thunderbolt...unless if the Pokemon
you are using is part Ground Type. It's a pretty powerful move at this point of the game.
Finally Sonic Boom does a fixed amount of damage, 20 HP to any Pokemon this move hits.
 Magnemite: 

 Level: 
 30
 Type: 
 Electric|Steel
 Ability: 
Magnet Pull ~ Prevents Steel Type Pokemon from escaping.
 Moves: 
Thunder Wave
Supersonic
Thunderbolt
Sonic Boom
 Review: 
 Magnemite could be annoying if it uses Thunder Wave to paralyze you and|or use Supersonic
to confuse your Pokemon. Other than that watch out for Thunderbolt...unless if the Pokemon
you are using is part Ground Type. It's a pretty powerful move at this point of the game.
Finally Sonic Boom does a fixed amount of damage, 20 HP to any Pokemon this move hits....
Deja vu Yep she has identical Pokemon in her team.
 Steelix: 

 Level: 
 45
 Type: 
 Ground|Steel
 Ability: 
Sturdy ~ The Pokemon is protected from 1 Hit KO Moves (Fissure, Drill Horn)
 Item: 
 Sitrus Berry
 Moves: 
Screech
Sandstorm
Iron Tail
Rock Throw
 Review: 
 Steelix is the power house of Jasmine's team. You want to use Special Super Effective
moves on it because of it's high defense. It can use Screech to lower your Pokemon's
Defense and use Sandstorm to chip away at it's HP. Rock Throw isn't so great unless if
Steelix already used Screech. Finally it has Iron Tail. It's powerful but has a 75% chance
of hitting the target Pokemon.
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"...You are a better trainer than me, in both skill and kindness. In accordance with
League rules, I confer upon you this Badge."

 Fun Facts: 
~The Olivine Gym is the only gym to have no trainers to battle except it's Gym Leader
~She is the only Female Gym Leader of Johto to admit defeat. Clair couldn't believe that
the player one and sends him|her to the Dragon's Den while Whitney just cries about it and
later gives the player the badge.
 Websites: 
-Seribii.net
-Bulbapedia
Good Luck in your battle with Jasmine!