[Oh no, she's cute! But seeing that others already answered a lot of questions here, and no, she's not going to go through all the stuff... This may or may not be new info.]
They're something that take a lot of traveling, badges I mean, and the further away the city is, the more levels the gym leader's pokemon has. So your pokemon need fighting experience and it takes time get them to the higher levels.
[Wait. Thinking back to her first time here.]
...Well, unless if you go with the ferry to Kanto, then Viridian is the exception. Because it's actually the one with Kanto's highest leveled gym, even though it's the city right after Pallet -- that's where the ferry goes to!
[video]
They're something that take a lot of traveling, badges I mean, and the further away the city is, the more levels the gym leader's pokemon has. So your pokemon need fighting experience and it takes time get them to the higher levels.
[Wait. Thinking back to her first time here.]
...Well, unless if you go with the ferry to Kanto, then Viridian is the exception. Because it's actually the one with Kanto's highest leveled gym, even though it's the city right after Pallet -- that's where the ferry goes to!