Why so much rage? Very rarely would you ever need a fully leveled poke. Lv30 pokes are perfectly usable. Even pokes as low as lv20 can put up a good fight if sent in against the right opponents. Plus, how many players are even up there in the high 38, 39 or even 40 for them to worry about having a maxed out poke?
Note that mobile games are not meant for people to "complete" overnight. Otherwise the game would be dead and people go find a new game. If you want a game easy to grind, go play pokemon on the consoles. XY ORAS Sun Moon all great series, I'm sure you'll have a nice week of pokemon if you run through all these.