I just restarted my FireRed. I chose Bulbasaur. It's nature is Hasty. I'm taking Professor Oak his parcel.
I just caught a level 3 Female Pikachu with my level 9 Bulbasaur. It has a Careful nature.
I beat Brock and then I beat the Jigglypuff trainer and my Bulbasaur evolved while it was asleep I caught a level 6 Male Nidoran with Calm Nature.
Encountered First Zubat.
My Pikachu has murdered countless Zubats at this point.
My first Team Rocket encounter.
I was doing so well. I had beaten four Gyms, and almost ready to beat my fifth. I had finished teaching Team Rocket a thing or two in Criminal Get-With-It 101. I was becoming a Pokemon Master...
And then that stupid Rocket Grunt had to walk up to me and shoot me. Just because I foiled their boring old plans to besiege Silph Co. and get money, they had to shoot me. Really.
That's how my last FireRed playthrough went. (I lost the cartridge, it still has my save file on it.)