You'd have an advantage over Sabrina, the Psychic gym leader from the First Generation. (That would be Blue/Red/Yellow and Firered/Leafgreen. You also visit Kanto in Gold/Silver/Crystal, but only after you defeat the elite four.) This listing is of Sabrina's Pokémon in the video games she has appeared in.
Pokémon Red/Green/Blue
[list]* Level 38 Kadabra: Disable, Psybeam, Recover, Psychic
* Level 37 Mr. Mime: Confusion, Barrier, Light Screen, Doubleslap
* Level 38 Venomoth: Poisonpowder, Leech Life, Stun Spore, Psybeam
* Level 43 Alakazam: Psybeam, Recover, Psychic, Reflect [/list]
Pokémon FireRed/LeafGreen
[list] * Level 38 Kadabra: Psybeam, Reflect, Future Sight, Calm Mind
* Level 37 Mr. Mime: Barrier, Psybeam, Baton Pass, Calm Mind
* Level 38 Venomoth: Psybeam, Gust, Leech Life, Supersonic
* Level 43 Alakazam: Psychic, Recover, Future Sight, Calm Mind [/list]
Pokémon Yellow
[list] * Level 50 Abra: Flash
* Level 50 Kadabra: Psybeam, Recover, Kinesis, Psywave
* Level 50 Alakazam: Psychic, Psywave, Reflect, Recover [/list]
Pokémon Gold/Silver/Crystal
[list] * Level 46 Espeon: Sand Attack, Quick Attack, Swift, Psychic
* Level 46 Mr. Mime: Barrier, Reflect, Baton Pass, Psychic
* Level 48 Alakazam: Recover, Future Sight, Psychic, Reflect [/list]
Pokémon Stadium
[list]* Round 1 Pokémon
o Alakazam
o Mr. Mime
o Kadabra
o Hypno
o Exeggutor
o Jynx [/list]
[list]* Round 2 Pokémon
o Mr. Mime
o Snorlax
o Exeggutor
o Wigglytuff
o Alakazam
o Hypno [/list]
Pokémon Stadium 2
[list]* Round 1 Pokémon
o Wigglytuff
o Alakazam
o Hypno
o Mr. Mime
o Slowbro
o Furret [/list]
[list]* Round 2 Pokémon
o Sandslash
o Hitmonlee
o Alakazam
o Typhlosion
o Slowking
o Scizor [/list]
When do you plan to travel to Saffron to take her on? I'll come watch. 🙂
Picture for reference. 🙂