Zapdos:Power Plant
Articuno:Seafoam Islands
Moltres:One island's volcano
Mewtwo:Cerulean Cave after beating the elite four and fixing Celio's Machine
Suicune:Roaming Kanto after beating elite four. You must have chosen charmander.
Raiku:Roaming Kanto after beating elite four. You must have chosen Squirtle.
Entei:Roaming Kanto after beating elite four. You must have chosen bulbasaur.
Mew:Long past Nintendo event/trade
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try fire red and leaf green packs
In Pokemon Leaf Green/Fire Red, you can catch: Clefairy (rare) paras (very common in certain places) zubat (common in most places) and geodude. (common in same places as zubat)
Leaf green is like fire red. The rare Pokemon that are "story-one-time-only" are (in leaf green/fire red.)are the three starter Pokemon(squirtle,charmander, bullbasaur) and heir evolved forms. then--- Mewtwo,articuno,entei,suicune,zapdos,raikou motres mew* lugia** ho-oh** celbi**only available at the time period of special events at seleced retail locations.**only available by trading with Pokemon XD or Pokemon colluseum for gamecube and trading using a gba/gamecube link cable or special events*Not counting legendaries:Sneasel, Magby, Chansey. Tauros, Kangeskhan, and Pinsir (also obtainable in the gamecorner )
Illumise, along with her male counterpart, Volbeat, are not considered "rare" Pokemon, but they are hard to find.
buy it at the rare Pokemon store