On your way through Viridian Forest, you should pick up a Pikachu (!!), a Caterpie, and a Weedle. Don't get Kakunas and Metapods, since Caterpie and Weedle will evolve into one eventually. There are a few easy trainers in the forest, they are Bug-catchers and use bugs, so fire works very well on them. The first has a pair of caterpillars at Level 6 (Caterpie/Weedle). The second has 2 Level 7 Weedles and a Level 7 Kakuna. The final trainer has a Level 9 Weedle. There is a Poke Ball, Antidote (comes in handy from the Weedles), and a Potion in the forest. Makes nice additions to your arsenal. By the way, the Pikachu is a VERY good asset because its only weakness is against ground Pokémon, and it is my favorite Pokémon anyway :-)
