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This many pokemon are in the original gen 1 games
151
Snorlax famously is the only way to get this item
Leftovers
This pokemon uniquely has 2 possible evolutions by level up
Wurmple
The gen 4 games famously introduced this new mechanic
The Physical Special Split
Gen 5 Patrat was a favorite of this evil team?
Team Plasma
This move is the only dragon move in gen 1
Dragon Rage
This change introduced a new stat greatly buffing or hurting some pokemon as a result
The Special Split
Rain and Sun have no effect on this pokemon
Rayquaza
This generation introduced this pokemon that is able to summon permanent weather
Abomasnow/Snover
These pokemon are some of the most hated pokemon of all time, in addition to be pseudo starters
The Monkeys( Pansage, Pansear, Panpour )
The gen 2 games introduced this new way of catching legendary pokemon
Roaming Legends
This mechanic gave each pokemon a special modifier to 2 of its stats, in addition to identifying its temperment
These 2 new pokemon were added as evolutions of an original gen 1 pokemon
Leafeon and Glaceon
This move was no longer a TM in this gen after being one in Dimond and Pear
Defog
Crits in gen 1 are not a 1 in 16 chance like in all subsequent generations, instead they are decided by this
Base Speed/Speed Stat
This Signature move is unique in being the only move with a 50% burn chance
Sacred Fire
Blaziken famously started this trend
Fire Fighting Starters
gen 4 introduced this new pokemon with 3 immunities
Giratina
Gen 5's Dream world game many pokemon new hidden abilties, such as these 2 pokemon who gained Groudon and Kyogre's abilities
Politoed and Ninetales
This pokemon is unique for being the only pokemon ever to have a Bird typing
Missingno
This is the single strongest attack in the game without any setup moves
Thick Club Marowak's Earthquake
EV Cap/No maxed out stats
Gen 4 introduced a new "Hazard" move in the form of this move
Stealth Rock
Gen 5 infamously broke this battle mechanic
Sleep