Question

Do all pokemon need the same amount of exp. points to grow to a certain level?

Answer 1

Adding to what Caveman said, each pokemon falls into one of these categories, the number being how much EXP that pokemon category takes to reach level 100:

Erratic - 600,000 EXP
Fast - 800,000 EXP
Medium-Fast - 1,000,000 EXP
Medium-Slow - 1,059,860 EXP
Slow - 1,250,000 EXP
Fluctuating - 1,640,000 EXP

A weak, but fast-evolving pokemon like Metapod would be in the Erratic or fast group, while more powerful pokemon like Dragonite or Tyranitar fall in the higher EXP range.

Comments

Metapod is in the medium-fast group.

Also keep in mind that levels of evolution, type, and strength of the Pokemon does not affect its EXP requirements. There really is no pattern to determine what's what.

Base EXP at level 5 is an easy way to tell.

1(?)8 - Erratic
72 - fast
44 - Medium slow
91 - Medium fast
114 - Slow
47 - Fluctuating

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I never knew what group Metapod was in. Thanks for that. But I just used it as an example showing that the weaker pokemon tend to be in that group.

Answer 2

No. Usually the stronger the Pokemon is supposed to get (stat wise), the longer it takes to level.

Answer 3

No, stronger pokemon need more experience, also note that pokemon of the same evolution chain need the same exp to get to a certain level. Although Gyrados is 1000x better than Magikarp, they both need 1,250,000 exp to reach level 100. For more information look here http://bulbapedia.bulbagarden.net/wiki/Experience