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In Yellow, I boxed Pikachu and just used Butterfree the entire game. Sleep Powder + Confusion from start to finish. Never raised anything else up because 'Why bother doing that when I can just make my main Pokemon stronger in the same timeframe?' Same mentality I had for the next three gens.
In Gold, I just used Feraligatr until I got a Doduo, which I evolved into a Dodrio because I was a huge Godzilla fan and autistic faggot and thought it was cool to have 'GODZILLA' and 'GHIDORAH' on my team.
In White, the grass starter was such a total piece of shit that I had to resort to using anything else I could get my hands on.
In Y, thanks to Exp Share, I was able to actually use multiple Pokemon because I wanted to, although Kalos had so many available that I got pretty overwhelmed.