This is my first time posting a team on here, so I apologize if it is somewhat underwhelming.
This was a fun little experiment; I wanted to try to make a team that was competitively viable with ONLY using Pokemon from the 1st Gen. Did I succeed? That's for you to decide.
The Lead
Aerodactyl @Focus Sash
Ability: Pressure
Nature: Jolly
252 Spd / 252 Attk / 4 Def
~Stealth Rock
~Taunt
~Rock Slide
~Earthquake
Great at either setting up entry hazards or keeping the opponent from setting up there own. Also, if I manage to keep him alive, he can be a pretty good revenge killer and attacker in the late game.
The Physical Wall
Weezing @Leftovers
Ability: Levitate
Nature: Bold
252 HP / 252 Def / 4 Sp. Attk
~Will-O-Wisp
~Pain Split
~Fire Blast
~Thunderbolt
A lot of people tend to underestimate Weezing due to its UU status. Their mistake. This guy can go toe-to-toe with some of the most powerful physical attackers and cripple them in the process. When he succeeds in his job, he makes life a heck of a lot easier for...
The Physical Sweeper
Gyarados @Leftovers
Ability: Intimidate
Nature: Adamant
252 Attk / 252 Spd / 4 Def
~Dragon Dance
~Waterfall
~Ice Fang
~Earthquake
Again, people tend to underestimate the power of the offensively oriented Dragon Dancer, favoring bulky variants. This plays right into this Gyarados' hands. He may not even need to set up, hitting an opponent expecting a bulky variant and taking them by surprise. As for those pesky electric attacks that spell certain doom for Gyarados...
The Bolt
Jolteon @Choice Specs
Ability: Volt Absorb
Nature: Timid
252 Spd / 252 Sp. Attk / 4 Sp. Def
~Thunderbolt
~Shadow Ball
~Hidden Power Grass
~Baton Pass
This guy hits like a truck, and with Gyarados and Aerodactyl attracting strong electric attacks, Jolteon is able to come in with impunity quite often. He can also act as a potent lure, Baton Passing away from sturdy Earthquake users who are then forced to deal with...
The Special Sweeper
Gengar @Life Orb
Ability: Levitate
Nature: Timid
252 Sp. Attk / 252 Spd / 4 Def
~Shadow Ball
~Focus Blast
~Thunderbolt
~Giga Drain
This guy is probably the MVP of my whole team, and particularly excels at late game sweeping. People claim that Gengar can be quite predictable. I beg to differ. By opting out of Hidden Power Fire, Gengar will always outspeed opposing Gengar who do carry it, which is invaluable to me. Giga Drain is great for picking off weakened opponents and keeping Gengar in the fray a little longer. It also packs great surprise value, taking Rock and Ground types completely by surprise. Like Gyarados, he benefits immensely from Weezing passing out burns. Now like the rest of the team, with the exception of Weezing, Gengar is frail. A Pokemon who can take special attacks and still pose as a potent threat is in order. Enter...
The Fatass
Snorlax @Leftovers
Ability: Thick Fat
Nature: Careful
188 HP / 104 Def / 216 Sp. Def
~Curse
~Rest
~Body Slam
~Earthquake
Ah yes. Curselax. Deemed to be inefficient by many today, Snorlax can come in and set up on a lot of opponents with the right support. Snorlax has particularly great synergy with Weezing. Weezing can burn strong physical attackers that would make setting up with Curse impossible otherwise. Also, he is one of the best checks to Heatran around, and does it while still posing as a potent offensive threat.
Well, that's it. I hope it doesn't suck too much. I know Bronzong in particular can give this team a whole mess of trouble. I've also considered swapping Gyarados for Dragonite, but I'm not sure. What do you think?
Thanks for your time, and I hope you enjoyed reading!
This was a fun little experiment; I wanted to try to make a team that was competitively viable with ONLY using Pokemon from the 1st Gen. Did I succeed? That's for you to decide.
The Lead

Aerodactyl @Focus Sash
Ability: Pressure
Nature: Jolly
252 Spd / 252 Attk / 4 Def
~Stealth Rock
~Taunt
~Rock Slide
~Earthquake
Great at either setting up entry hazards or keeping the opponent from setting up there own. Also, if I manage to keep him alive, he can be a pretty good revenge killer and attacker in the late game.
The Physical Wall

Weezing @Leftovers
Ability: Levitate
Nature: Bold
252 HP / 252 Def / 4 Sp. Attk
~Will-O-Wisp
~Pain Split
~Fire Blast
~Thunderbolt
A lot of people tend to underestimate Weezing due to its UU status. Their mistake. This guy can go toe-to-toe with some of the most powerful physical attackers and cripple them in the process. When he succeeds in his job, he makes life a heck of a lot easier for...
The Physical Sweeper

Gyarados @Leftovers
Ability: Intimidate
Nature: Adamant
252 Attk / 252 Spd / 4 Def
~Dragon Dance
~Waterfall
~Ice Fang
~Earthquake
Again, people tend to underestimate the power of the offensively oriented Dragon Dancer, favoring bulky variants. This plays right into this Gyarados' hands. He may not even need to set up, hitting an opponent expecting a bulky variant and taking them by surprise. As for those pesky electric attacks that spell certain doom for Gyarados...
The Bolt

Jolteon @Choice Specs
Ability: Volt Absorb
Nature: Timid
252 Spd / 252 Sp. Attk / 4 Sp. Def
~Thunderbolt
~Shadow Ball
~Hidden Power Grass
~Baton Pass
This guy hits like a truck, and with Gyarados and Aerodactyl attracting strong electric attacks, Jolteon is able to come in with impunity quite often. He can also act as a potent lure, Baton Passing away from sturdy Earthquake users who are then forced to deal with...
The Special Sweeper

Gengar @Life Orb
Ability: Levitate
Nature: Timid
252 Sp. Attk / 252 Spd / 4 Def
~Shadow Ball
~Focus Blast
~Thunderbolt
~Giga Drain
This guy is probably the MVP of my whole team, and particularly excels at late game sweeping. People claim that Gengar can be quite predictable. I beg to differ. By opting out of Hidden Power Fire, Gengar will always outspeed opposing Gengar who do carry it, which is invaluable to me. Giga Drain is great for picking off weakened opponents and keeping Gengar in the fray a little longer. It also packs great surprise value, taking Rock and Ground types completely by surprise. Like Gyarados, he benefits immensely from Weezing passing out burns. Now like the rest of the team, with the exception of Weezing, Gengar is frail. A Pokemon who can take special attacks and still pose as a potent threat is in order. Enter...
The Fatass

Snorlax @Leftovers
Ability: Thick Fat
Nature: Careful
188 HP / 104 Def / 216 Sp. Def
~Curse
~Rest
~Body Slam
~Earthquake
Ah yes. Curselax. Deemed to be inefficient by many today, Snorlax can come in and set up on a lot of opponents with the right support. Snorlax has particularly great synergy with Weezing. Weezing can burn strong physical attackers that would make setting up with Curse impossible otherwise. Also, he is one of the best checks to Heatran around, and does it while still posing as a potent offensive threat.
Well, that's it. I hope it doesn't suck too much. I know Bronzong in particular can give this team a whole mess of trouble. I've also considered swapping Gyarados for Dragonite, but I'm not sure. What do you think?
Thanks for your time, and I hope you enjoyed reading!