Here are the Teams for everyone. I hope it clears up any confusion. Although, some characters are not revealed until the end of the first chapter and if you want to be somewhat surprised, I suggest you wait and then come back to this.
The Girls
Allie Smith – age 18 –Elite Four Champion of Unova and Sinnoh
Team: Houndoom –Fire type- male- lv. 87 - Eruption, Hyper Beam, Flamethrower, Dark Pulse
Dialga – Dragon/Steel type - male – lv. 90 – Roar of Time, Aura Sphere, Flash Cannon, Dragon Pulse
Espeon – Psychic type - female – lv. 82 – Psychic, Morning Sun, Shadow Ball, Giga Impact
Luxray – Electric type- male – lv. 85 – Thunder, Volt Switch, Shock Wave, Thunder Fang
Lapras – Water/Ice type- female – lv. 79 – Surf, Ice Beam, Sheer Cold, Hydro Pump
Leafeon –Grass type – female – lv. 77 – Energy Ball, Leaf Blade, SolarBeam, Giga Drain
Dawn Berlitz – age 18 – aspiring coordinator
Team: Piplup – Water type - Male – lv. 31 - Bubblebeam, Fury Attack, Peck, Ice Beam
Staravia – Normal/Flying type – Male – lv. 28 – Quick Attack, Wing Attack, Gust, Aerial Ace
Butterfree – Bug/Flying type – Female – lv. 26 – Stun Spore, Silver Wind, Struggle Bug, Energy Ball
Vulpix – Fire type – Male – lv.28 – Fire Spin, Flame Burst, Smokescreen, Quick Attack
May Maple– age 18 – Lab aide to Professor Oak/aspiring coordinator
Team: Blaziken – Fire/Fighting type – male – lv. 40 – Overbeat, Blaze kick, Flamethrower, Sky Uppercut
Beautifly – Bug/Flying type – female – lv.36 – Psychic, Silver Wind, Morning Sun, Gust
Skitty – Normal type – female – lv. 28 – Tackle, Blizzard, Fire Spin, Razor Leaf
Venusaur – Grass/Poison type – female – lv. 38 – Vine Whip, Tackle, Razor Leaf, Petal Dance
Munchlax – Normal type – male – lv. 30 – Metronome, Focus Punch, SolarBeam, Tackle
Glaceon – Ice type – female – lv. 36 – Ice Beam, Iron Tail, Ice Shard, Secret Power
Misty Waterflower– age 18 - aspiring Gym Leader to Cerulean City
Team: Blastoise – Water type – Male – lv. 37 – Water Pulse, Aqua Tail, Rapid Spin, Bite
Starmie – Water/Psychic type – Female – lv. 40 – Water Pulse, Rapid Spin, Ice Beam, Psychic
Vaporeon – Water type – Female – lv. 36 – Water Pulse, Surf, Aurora Beam, Ice Beam
Togepi – Normal type – lv. 8 – Male – Yawn, Follow Me, Charm, Tackle
Leaf Green– age 18 – aspiring Trainer
Team: Charizard – Fire/Flying type – male – lv. 48 – Flamethrower, Fire Spin, Dragon Rage, Dig
Jolteon – Electric type – male – lv. 42 – Thunder, Thunder Fang, Discharge, Volt Switch
Nidoking – Poison/Ground type – male – lv. 46 – Earth Power, Megahorn, Earthquake, Poison Jab
Poliwrath – Water/Fighting type – male – lv.45 – Seismic Toss, Dynamic Punch, Surf, Scald
Vileplume – Grass/Poison type – female – lv.44 – Giga Drain, Solarbeam, Grass Knot, Poisonpowder
Gengar – Ghost/Poison Type – male – lv.47 – Dark Pulse, Shadow Ball, Hypnosis, Dream Eater
The Boys
Gary Oak– Age 18 – aspiring trainer
Team: Blastoise – Water type – male – Lv. 54 – Hydro Pump, Rapid Spin, Surf, Bite
Umbreon – Dark type – male – lv.50 – Skull Bash, Psychic, Moonlight, Shadow Ball
Electivire – Electric type – male – lv. 51 - Thunder, Thunder Punch, Iron Tail, Protect
Arcanine – Fire type – male – lv. 52 – Take Down, Fire Spin, Fire Blast, Flamethrower
Golem – Rock type – male – lv.54 – Take Down, Rollout, Magnitude, Dig
Aerodactyl – Rock/Flying type – male – lv. 56 – Gust, Hyper Beam, Ancientpower, Rock Slide
Paul Shinji– age 19 – aspiring trainer
Team: Torterra – Grass/Ground type – male – lv. 55 – Giga Drain, Hyper Beam, Leaf Storm, Crunch
Aggron – Steel/Rock type – male – lv. 53 – Metal Claw, Iron Tail, Double Edge, Flash Cannon
Honchcrow – Dark/Flying type – male – lv. 51 – Sky Attack, Shadow Ball, Night Slash, Haze
Magmortar – Fire type – male – lv. 52 – Flamethrower, Fire Punch, Rock Tomb, Fire Spin
Gastrodon – Water/Ground type – male – lv.50 – Muddy Water, Body Slam, Water Pulse, Ice Beam
Drapion – Poison/Dark type – male – lv. 53 – Pin Missile, Cross Poison, Toxic Spikes, Poison Fang
Drew Hayden– age 18 – aspiring coordinator
Team: Roserade – Grass/Poison type – male – lv. 35 – SolarBeam, Magical Leaf, Mega Drain, Stun Spore
Masquerain – Bug/Flying type– female – lv. 38 – Silver Wind, Hidden Power, Quick Attack, Ice Beam
Flygon – Ground/Dragon type – male – lv. 40 – Dragonbreath, Flamethrower, Sandstorm, Steel Wing
Absol – Dark type – male – lv.35 – Flash, Iron Tail, Razor Wind, Water pulse
Butterfree – Bug/Flying type – female – lv. 33 – Confusion, Gust, Psybeam, Protect
Ash Ketchum– age 18 – aspiring trainer
Team: Pikachu – Electric type – male – lv. 58 – Iron Tail, Volt Tackle, Electro Ball, Double Edge
Charizard – Fire/Flying type – male – lv. 55 – Overheat, Flamethrower, Dragon Tail, Seismic Toss
Tauros – Normal Type – male – lv. 48 – Horn Attack, Take Down, Body Slam, Fissure
Squirtle – Water Type – male – lv.22 – Hydro Pump, Rapid Spin, Bubblebeam, Skull Bash
Bayleef – Grass type – female – lv. 38 – Razor Leaf, Vine Whip, Body Slam, Headbutt
Muk – Poison type – male – lv. 45 – Body Slam, Poison Gas, Sludge Bomb, Gunk Shot
Red Bern– age 18 – aspiring trainer
Team: Meganium – Grass type – female – lv. 50 – Razor Leaf, Body Slam, Giga Drain, Synthesis
Feraligatr – Water type – male – lv. 50 – Surf, Slash, Blizzard, Bite
Typhlosion – Fire type – male – lv. 50 – Flamethrower, Thunder Punch, Dig, Quick Attack
Jolteon – Electric type – female – lv. 50 – Thunder, Bite, Thunder Wave, Quick Attack
Scizor – Bug/Steel type – male – lv. 50 – Metal Claw, Quick Attack, Slash, Sleep Talk
Tauros – Normal type – male – lv. 50 – Headbutt, Earthquake, Hyper Beam, Iron Tail