For those who know me, this should come as a surprise to absolutely none of you. For those who don't know me...uh....surprise! Yes, the number one Pokemon in the Pokedex is also the number one Pokemon in my heart. Bulbasaur is, in my opinion, the cutest Pokemon of all time. It's cuter than things like Jigglypuff and Clefairy because I feel they try too hard to be cute. It's better than things like Treecko and Torchic because it looks tough enough to defend me, even as just a base form Starter. Really, Treecko looks like you can snap it in two with your pinkie.
In terms of design, I'm...not really sure what it's supposed to be. A frog? A dinosaur? Who cares. It looks badass. And the way its evolutionary line mirrors a plant's maturity cycle (subtly showcasing how Pokemon evolution works at the same time) was just a brilliant touch.
Also, Ash's Bulbasaur in the anime was absolutely boss. Again, I make note of its bromance with Squirtle, but more importantly than that, its major stubborn streak really got Ash through many tough battles (even playing a crucial part in his battle against Pyramid King Brandon.) But it also has some major depth of character (as opposed to, say, Charizard,) explored when it became a diplomat in Professor Oak's lab.
In the games, Bulbasaur makes an excellent Starter Pokemon. It is strong against Brock, Misty, Lt. Surge, Erika and Giovanni. And yes, I'm talking about base form Bulbasaur, whom I trained in Pokemon LeafGreen. Remember when I said I wanted to buy Pokemon Blue even though Generation II had already come out? It was solely for the purpose of getting a Bulbasaur. So far, I've trained multiple Bulbasaur in Pokemon Blue, Yellow, Silver, Emerald, Sapphire, FireRed, LeafGreen, Platinum, Heartgold, Soulsilver, Black, and Pokemon White 2. That's A LOT of Bulbasaur.
Ivysaur is the member of the trio that I give the least attention to. With that said, it still looks amazing. Definitely one of the better designed middle form Starters of all time (along with the Johto group, Grovyle and Dewott.) Even though I've trained less Ivysaur than the other two overall, that's still an Ivysaur for Pokemon Silver, Soulsilver, Platinum, Black, and Pokemon White 2.
Then there's big daddy Venusaur. Never in my life have I seen a pink flower (actually a rafflesia, but it sure looks like a flower) be so badass. I'm just gonna save myself the trouble and state that I've trained at least one Venusaur in every single main series Pokemon game I have ever played. Venusaur has a balanced stat spread, with not a single one of its base stats being under 80. This gives it the ability to become a Jack of all trades sort of battler. It can go physical tank, special sponge, Subseeder, annoyer, physical attacker, special attacker, you name it. This versatility landed Venusaur highly in UU usage, and it even got banned to BL a few times. And this was before
Generation V. With Generation V, Venusaur now gets Chlorophyll, a buffed up Growth, and a perfect partner in the form of Drought Ninetales. The perfect recipe for what is arguably the best sun sweeper in the game. I've used Venusaur in OU, and lemme tell you, there is a grand total of one
Pokemon that can stop it in its tracks once it gets going. Heatran. But not even Heatran can counter all of Venusaur's sets. This is why Venusaur has earned a solid position in OU.
And yes, I'll admit, nostalgia does play a part in my love for Bulbasaur. I got into the series through Bulbasaur. I got into the anime because of Bulbasaur. I got into the games because of Bulbasaur. Bulbasaur represents my childhood, and it represents Pokemon to me. So yeah, nostalgia is a factor. Not the biggest one, but it is worth mentioning.
So yeah, I'll stop rambling now. I'll end on this note: Bulbasaur is my favorite Pokemon of all time. New Pokemon will come, old Pokemon will get better, but nothing will ever change the way I feel about the Bulbasaur family.