Back in the day, if you played Red or Blue, and picked Charmander, you had the most difficult time in the early game because of your type disadvantage in the first two gyms.
However, when FR/LG came out, Charmander got Metal Claw at level 9, and made Brock way easy to beat, and veterans of the series would have easily gotten a Pikachu in the Viridian Forest for Misty, making it so you have absolutely no disadvantage or even a challenge if you picked Charmander. /rant
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@GoaFan77: It is actually implied that Charmander is supposed to be the hardest to use starter.
You notice when you cycle through the starters, Oak gives a comment about each starter, with him specifically saying it would be harder to raise Charmander.
He essentially says:
Bulbasaur: Easy Mode Squirtle: Normal Mode Charmander: Hard Mode
Yes, but just the type distribution of the gym leaders kind of forces that. I don't see why they should do anything else to make it that way. Heck, they should have made a grass type catchable in Viridian Forest, but I guess metal claw was a reasonable alternative.
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