As a suggestion i would have to say its not a great one.
Increasing the number of pokes/level of pokes that gym leaders have will just mean that players would need to grind on wild pokes to raise the level of their pokes. Also the thing i have found that works best about this game is the pvp aspect. The meta game is dominated by competitive players battling it out to win tourneys. This does however require a great deal of grinding and luck to catch competitive pokes and train them. However, the pvp aspect makes it worth it. There are also those people that like to collect pokemon or shiny pokes.
If you dont like grinding and pvp then you may find the meta game boring, however, completing the game is just the start for many players