All depends on skill level. Cyndaquil gives the easiest game, while totodile is for intermediate players. Chickorita is for experts, as s/he is the hardest to work with. but if its just for fun... choose your fave!
I went with cyndaquil..its very strong! i suggest cynadaquil cause typhlosion is a sweeper..but chikorita is a good choice too(make sure you go with a girl chikorita ) but i hate totodile
Cyndaquil is best. Chikorita is weak against the first gym, and water pokemon like Tododile are a dime a dozen. Cyndaquil is strong against the second gym, and fire pokemon are uncommon, so Cyndaquil is the best.