Electric Type moves don't effect Rock Type and Ground Type Pokemon.
Lotad, and Lombre are the only Water and Grass Types in the game. The third evolution, Ludicolo, cannot be obtained.
Electabuzz is the strongest Electric Type in the game, having 4 moves, and learning moves faster than Pikachu. Magneton only has three moves, making him inferior, though Magneton gets a Steel typing to help it.
Oddish and Chikorita, Bayleef, and Meganium are the only pure grass types in the game.
Haunter and Gengar are the only ghost-types in the game.
Heracross and Lucario are the only fighting types in the game, the former being Bug/Fighting and the latter being Steel/Fighting.
Aron its immune to the eletric move,in the power plant , pikachus and magnemites can't kill you easily,its good for make a exp farming.
The Pokemon can do more damage depending on the type,example:A pokemon with water movements give us much damage tipe stone and fire type moves deal more damage to pokemons grass type
Heracross, despite being Bug/Fighting, can't learn any bug/fighting moves.
Haunter is the only catchable ghost type
Pichu and Rattata are the lowest level pokemon in the game