When I do I always keep the regional starter as my main and don't honestly plan the rest of my team that well (often to my detriment
) I never play competitive so my strategy is largely "Be 40 levels higher than my opponent and never bother to use status moves." The rest of my team ends up either being random pokemon I caught at the start of the game and kept around for sentimental reasons (eg. A staraptor I first caught as a starly in the first area) or just pokemon I catch that I think are cool (very rarely I think about varying my types for type advantage. But cool usually wins >,>) That being said I actually do think they should make at least one more game with a national dex. It would be very nice, I think to have at least one game on the switch (or I guess the next Nintendo console if it's going to be more powerful) that has a national dex to transfer all your pokemon up to. I also realize however that honestly, there's a
lot of pokemon and they can't reasonably add a national dex in every new game
and a hundred or so new ones. I feel like a mainline game with a national dex every now and then would be awesome but I wouldn't expect it for every single game. But either way just one more game with all 1000+ pokemon would be more than enough for me.