I think this is a fairly simple thing that would bring some advantages to the game.
My suggestion comes in 2 parts:
- An option for that when we sort our pokemon, the pages would be ignored. In example, if we sorted per level, the highest levels would be all in the last pages and not scattered around in the end of each page.
- More options of sorting, being the main two i have: per pokedex number and per zone caught (Kanto, Johto,...)