Emma MacDonald Asked: Quick Pokemon Fire Red Team Evaluation?

I have a team in mind that I'm training for the Indigo Plateau, but I don't know if there are any particular weaknesses I should be aware of.
My pokemon team & moveset are as follows:

Dragonair
– Slam
– Thunder Wave
– Thunderbolt
– Agility

Pidgeot
– Aerial Ace
– Featherdance
– Fly
– Agility

Venusaur
– Giga Drain
– Poisonpowder
– Leech Seed
– Razor Leaf

Wigglytuff
– Brick Break
– Calm Mind
– Psychic
– Strength

Moltres
-Agility
– Flamethrower
– Double Team
– Toxic

Gyarados
– Earthquake
– Rain Dance
– Surf
– Sandstorm

I'm not staying completely static with each move here, especially if someone spots a problem. Also, I'll replace one pokemon with another if it's better to do so.