This time with a little step-by-step based on RBY to help break things down into manageable bites; as you list individual mon by prompt, go ahead and add their full line to your dex. Go ahead and post descriptions of each route/dungeon for extra fun. Obviously you don't have to keep things in this specific order if you care to shuffle things around.
>Starters
>Town 1
>Route 1
>Town 2

>Route 2
>Dungeon 1
>Town 3
>Gym 1

>Route 3
>Route 4
>Dungeon 2
>Town 4
>Gym 2

>Route 5
>Route 6
>Town 5
>Gym 3

>Route 11
>Dungeon 3
>Route 12
>Town 6
>Dungeon 4

>Route 8
>Town 7
>Gym 4
>Dungeon 5

>Route 18
>Town 8
>Gym 5
>Dungeon 6

>Route 15
>Route 14
>Route 13
>Town 9
>Gym 6
>Evil Team

>Route 19
>Route 20
>Dungeon 7
>Town 10
>Gym 7
>Dungeon 8

>Route 21
>Gym 8

>Route 22
>Route 23
>Victory Road
>Pkmn League