Catch Pokemon
All the Pokemon You Can Catch!
For those of You wondering about the various types of Pokemon you can catch in the game, here is the clincher, you can catch almost all of the original monsters on the Gameboy, plus a few from the later generations. However it will take a bit of time and effort to actually catch em all. The level requirements mean that the Pokemon will have the chance to evolve automatically upon reaching that specific level.
Some evolutions are not triggered by level gains, some are triggered by the use of evolution stones that can be bought at the PokeMart (they sell for 10,000 credits apiece). Another form of evolution is done through trade. To do this, simply go to the trading center by selecting "trade" in the main memu. Set the desired Pokemon up for trade, then send the Pokemon back to your profile. This will automatically evolve the Pokemon.
So without further ado, here is all the Pokemon you can get, and what they will evolve to.
From Oak's Laboratory
A quick note about Bulbasaur, Charmander and Squirtle: you can only choose one of the three. Once you make a selection, the other two become unavailable. The only way to get them if you skip them is through trading.
Bulbasaur available from the start, changes into Ivysaur at level 16 and Venusaur at level 32.
Charmander available from the start, changes into CHARMELEON at level 16 and CHARIZARD at level 36.
SQUIRTLE available from the start, changes into WARTORTLE at level 16 and Blastoise at level 36.
Out in the Wild
CATERPIE can be caught in the Viridian Forest, turns into METAPOD at level 7 then into BUTTERFREE at level 10.
WEEDLE can be caught in the Viridian Forest, turns into KAKUNA at level 7, then to BEEDRILL at level 10.
PIDGEY can be caught in Route 1, turns into PIDGEOTTO at level 18 then to PIDGEOT at level 36.
RATTATA can be caught in Oak's Lab, turns into RATICATE at level 20.
SPEAROW can be caught in Route 3, turns into FEAROW at level 20.
EKANS can be caught in Mt. Moon 1, turns into ARBOK at level 22.
PIKACHU can be caught in the Viridian Forest, turns into RAICHU with a Thunder Stone
SANDSHREW can be caught in Mt. Moon 1, turns into SANDSLASH at level 22.
NIDORAN (female) can be caught in Route 3, turns into NIDORINA at level 16 and into NIDOQUEEN with a Moon Stone.
NIDORAN (male) can be caught in Route 3, turns into NIDORINO at level 16 and into NIDOKING with a Moon Stone.
CLEFAIRY can be caught in Mt. Moon 1, turns into CLEFABLE with a Moon Stone.
VULPIX can be caught in Mt. Moon 2, turns into NINETAILS with a Fire Stone.
JIGGLYPUFF can be caught in Route 3, turns into WIGGLYTUFF with a Moon Stone.
ZUBAT can be caught in Mt. Moon 1, turns into GOLBAT at level 22.
ODDISH can be caught in Mt. Moon 2, turns into GLOOM at level 21 and into VILEPLUME with a Leaf Stone.
PARAS can be caught in Viridian Forest 2, turns into PARASECT at level 24.
VENONAT can be caught in the Safari Zone, turns into Venomoth at level 31.
Diglett can be caught in Diglett's Cave, turns into Dugtrio at level 26.
MEOWTH can be caught in Route 5, turns into PERSIAN at level 28.
PSYDUCK can be caught in Cerulean Gym with the Super Rod, turns into GOLDUCK at level 33.
MANKEY can be caught in Route 3, turns into PRIMATE at level 28.
GROWLITHE can be caught in Mt. Moon 2, turns into ARCANINE with a Fire Stone.
POLIWAG can be caught in Mt. Moon 2, turns into POLIWHIRL at level 25 and into POLIWRATH with a Water Stone.
ABRA can be caught in Cerulean Gym, turns into Kadabra at level 16, and into ALAKAZAM through trade.
Machop can be caught in the Rock Tunnel, turns into Machoke at level 29, and into Machamp through trade.
BELLSPROUT can be caught in Mt. Moon 2, turns into WEEPINBELL at level 21, and into VICTREEBELL with a Leaf Stone.
GEODUDE can be caught in Mt. Moon 1, turns into GRAVELER at level 25, and into GOLEM through trade.
PONYTA can be caught in Cinnabar Island, turns into RAPIDASH at level 40.
SLOWPOKE can be caught in the Safari Zone, turns into SLOWBRO at level 37.
MAGNEMITE can be earned as a Mystery Gift Pokemon, turns into MAGNETON at level 30.
FARFETCH'D can be earned as a trade reward for Spearow at Vermillion City, does not evolve.
DODUO can be caught in the Safari Zone, turns into DODRIO at level 31.
SEEL can be earned as a Mystery Gift Pokemon, turns into DEWGONG at level 34.
GRIMER can be caught in Cinnabar Island, turns into MUK at level 38.
SHELLDER can be caught in Vermillion City with the Super Rod, turns into CLOYSTER with the Water Stone.
GASTLY can be caught in Poke Tower 1, turns into HAUNTER at level 25, and into GENGAR through trade.
Onix can be caught in Rock Tunnel, does not evolve.
DROWZEE can be caught in Diglett's Cave, turns into HYPNO at level 26.
KRABBY can be caught in Cerulean Gym with Super Rod, turns into KINGLER at level 28.
VOLTORB can be caught in Rock Tunnel, turns into ELECTRODE at level 30.
EXEGGCUTE can be caught in the Safari Zone, turns into EXEGCUTOR with the Leaf Stone.
CUBONE can be caught in Poke Tower 1, turns into MAROWAK at level 28.
HITMONLEE and HITMONCHAN are awarded when you finish Saffron Dojo, but you may only choose one of the them (you can gain the other through trade).
LICKITUNG can be earned as a Mystery Gift Pokemon, it does not evolve.
KOFFING can be caught in Cinnabar Island, turns into WEEZING at level 35.
RHYHORN can be caught in the Safari Zone, turns into RHYDON at level 42.
CHANSEY can be caught in the Safari Zone, it does not evolve.
TANGELA can be caught in Pallet Town, it does not evolve.
KANGASKHAN can be caught in Safari Zone, it does not evolve.
HORSEA can be caught in Route 19, turns into SEADRA at level 32.
GOLDEEN can be caught in Route 12, turns into SEAKING at level 33.
STARYU can be caught in Route 19, turns into STARMIE with the Water Stone.
MR. MIME can be obtained by trading an Abra at Route 2, it does not evolve.
SCYTHER can be caught in the Safari Zone, it does not evolve.
JYNX can be obtained by trading a Poliwhirl at Cerulean Gym, it does not evolve.
MAGMAR can be caught in Cinnabar Island, it does not evolve.
PINSIR can be caught in the Safari Zone, it does not evolve.
TAUROS can be caught in the Safari Zone, it does not evolve.
MAGIKARP can be caught in Cerulean Gym with the Old Rod, turns into GYARADOS at level 20.
LAPRAS can be caught in Route 12, it does not evolve.
DITTO can be caught in Route 15, it does not evolve.
EEVEE can be caught in Route 18, and it can evolve into three forms. Giving it a Water Stone will turn it into a VAPOREON, a Lightning Stone will turn it into a JOLTEON, and a Fire Stone will turn it into a FLAREON.
PORYGON can be purchased from the Game Corner, it does not evolve.
OMANYTE can be chosen at Cinnabar Island, turns into OMASTAR at level 40. Or players can choose Kabuto which turns into KABUTOPS at level 40.
AERODACTYL is awarded as a prize for completing Cinnabar Island without losing a single candy.
SNORLAX can be caught in Poke Tower 2, it does not evolve.
ARTICUNO can only be obtained by beating Seafoam Island with a party of level 100 Ice Pokemon.
ZAPDOS can only be obtained by beating the Power Plant with a party of level 100 Electric Type Pokemon.
MOLTRESS can only be obtained by beating Victory Road with a party of level 100 Fire Type Pokemon.
DRATINI can be caught in the Safari Zone, turns into DRAGONAIR at level 30 and into DRAGONITE at level 55.
MEWTWO cannot be caught.
MEW can be earned as a Mystery Gift Pokemon, it does not evolve.
RAIKOU can be adopted from the Pokemon Adoption Center, it does not evolve.
ENTEI can be adopted from the Pokemon Adoption Center, it does not evolve.
SUICUNE can be adopted from the Pokemon Adoption Center, it does not evolve.
CELEBI cannot be caught.
KYOGRE cannot be caught.
GROUDON cannot be caught
VICTINI was originally available as a Mystery Gift Pokemon, it does not evolve.
Final Notes:
The three legendary birds, Articuno, Zapdos, and Moltres, will be your final targets as they require 18 level 100 Pokemon to defeat (6 level 100 Pokemon for fire, lightning and water types).
Raikou, Entei and Sucine are called the three legendary beasts (or legendary cats/legendary dogs). They were voted in by fans to be turned into being permanently available, but the chances of owning one are extremely low.
Lastly, obtaining a Victini is still possible even if it's no longer available as a Mystery Gift. But players will have to scour the trades for a good deal.