These are the steps to get the following pokemon:
Bulbasure: Go to Curulian city and go to the house next to the pokemon center, talk to the girl and she'll give you Bulbasure
Squrtle: After you get the 3rd badge go to Vermillon city and talk to the officer in the southern part of town, she should give you Squrtile
Charmander: Go thourgh the path with the 5 trainers are on the bridge, then get to the land, go to the northwestern part of the land, talk to the trainer in the corrnor, he'll give you Charmander
Zapdos: Go to Curulian city and cut down the tree at the east part, then go to the river, use surf and go down it, keep going till you reach the land there will be a biulding there go in it and slove the puzzle to get Zapdos
Follow these short diretions and you'll have them all! Trust me, I have the game...