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It's such a tough choice. Can I say all of them? Well maybe except Chimchar, but it's not that I don't like it, but it's not as cool as the rest of them. I guess that's why they're starters.
In order from favorite to least favorite:
Kanto: Bulbasuar, Squirtle, Charmander
Johto: Chikorita, Totodile, Cyndaquil
Hoenn: Torchic (Mudkip and Treecko are tied)
Sinnoh: Turtwig, Piplup
IN oreder from favorite to least: Mudkip, Squirtle, Totodile, Torchic, Turtwig, Charmander, Bulbasuar, CYndaquil, Piplup, Chikorita, and last Chimchar.
I really like Meganium, and Blastoise. But my favourite from each region are; Squirtle, Chikorita, Torchic, Turtwig and Tsu-- whatevertheIsshustartersnameis. I usually tend to like the Grass starters. :3
Used to be Venusaur, nowadays it's a toss-up between him and Torterra. I guess it's their burly (or in Venusaur's case, fat :P) appearance that does it for me.
I always stick to using the Grass-types, too, seeing as that's my favorite Pokémon type in general.