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1st Charmander- can learn Flamethrower, Fly, Earthquake, and Dragon Pulse, good attacks

2nd Cyndaquil, can learn Flamethrower, Earthquake, Eruption,

3rd Mudkip- can learn Earthquake, all Water attacks, Grass Knot, and Dragon Pulse

4th Piplup/Chimchar- good attacks. Turtwig is slow and dont have a good movepool

i think the best starter pokemon in leaf green in bulbasaur because there is no fire gym at the starter of the game. it can easily defeat the first two gyms brock and misty and it can also defeat the electric gym ,if the it is in good level. if u are playing in vba so here is the cheat code for rare candy which will help it to lvl up:-

Anti-DMA(needed)

8D671FD9 6F6BEFF2

78DA95DF 44018CB4

999x Rare Candy

06AB3172 BE88C550